Malicious PDF — malware analysis report

Static analysis result for SHA-256 5106b219754ad7c4…

MALICIOUS

PDF

101.3 KB Created: 2021-06-05 03:57:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 96e898418d8d0e4ee5527e7b35278e9f SHA-1: cb498e452c6c026b21f4f32eb7ce3671288c4dd5 SHA-256: 5106b219754ad7c417be52815bfb4a81537c6d2ac76b85fb578ef23e9d1eba03
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many pointing to disposable hosting services, indicating a link farm designed to drive traffic to potentially malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://infrive.ru/pbw?utm_term=123+free+movies+online+unblocked PDF link annotation
    • https://navaraze.weebly.com/uploads/1/3/4/6/134682655/xapese_pataj_rokupo.pdfIn PDF document text
    • https://rigepapesoruzu.weebly.com/uploads/1/3/4/5/134519565/fbeb610.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414175/normal_605f5d4176dbd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454668/normal_606c881853a79.pdfIn PDF document text
    • https://jajozopikikaju.weebly.com/uploads/1/3/4/3/134359408/d1ae87f.pdfIn PDF document text
    • https://foxanebipukete.weebly.com/uploads/1/3/4/3/134309218/boxexepulokabuli.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495551/normal_605fdf5b21ac8.pdfIn PDF document text
    • https://dexanefuv.weebly.com/uploads/1/3/1/3/131383512/699d4e2817.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445739/normal_604cfa53e3503.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386834/normal_60476b2ceefa0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458394/normal_6033fc44ca328.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457849/normal_602d63ad2dbf2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471969/normal_604d1f068b6b8.pdfIn PDF document text
    • https://luvodufugatese.weebly.com/uploads/1/3/4/8/134893210/2040637.pdfIn PDF document text
    • https://dupemokuko.weebly.com/uploads/1/3/4/7/134759865/2087364.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498324/normal_60b8a8733d02a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477164/normal_60604fc3e7d6a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://buvavipoluvu.pbworks.com/f/crasher_origin_mod_apk_terbaru.pdfIn PDF document text
    • http://redejok.pbworks.com/w/file/fetch/144515685/terraria_map_all_items_1.3.0.7.7.pdfIn PDF document text
    • http://jitilabajeko.pbworks.com/f/durabomowozeker.pdfIn PDF document text
    • http://nikekuva.pbworks.com/f/ferruccio_lamborghini_and_enzo_ferrari.pdfIn PDF document text
    • http://lagawiwefe.pbworks.com/f/55146709522.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off00015df2.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x15DF2 17056 bytes
SHA-256: de3fb736f5607487c068e19d0351aa1d9777d3a727481056ca44fcefcff2606f
font_00_sfnt_off0000e82e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE82E 5476 bytes
SHA-256: 64ab38664df97c9154ff0a0c410751848fc168d1a4a792205e7e437c641b80ca
font_01_sfnt_off0000fac5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAC5 3188 bytes
SHA-256: 5cad7acfe6654b12a575de28089209241f1cee6a21241cfebcea3c9ef4ac8447
font_02_sfnt_off000106c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106C4 17232 bytes
SHA-256: df5dad5594d828d46ca4f831985dc9d7d5c6904c5efb631d5d5acabfa6339651
font_03_sfnt_off0001395d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1395D 10632 bytes
SHA-256: 849726b6c8aa4235b36d6e18b6f24fbafdacca488b0144f87fbf42b35835ae3d
font_05_sfnt_off00017655.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17655 3544 bytes
SHA-256: 73a18de5977f366cdadd6096a7c4a5feac486b68e7372b8df06fde7ee4e54dc9

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