Malicious PDF — malware analysis report

Static analysis result for SHA-256 3616b8530b0bf2a1…

MALICIOUS

PDF

82.8 KB Created: 2021-04-08 17:13:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: b97f50e1f755a0da3dcef37fe893f7ba SHA-1: d38422266bf81a2ad75096bd59a4bf740f1f26f3 SHA-256: 3616b8530b0bf2a153077a54d5142b0759941a80cb326dc2098ead09d73dae0c
244 Risk Score

Malware Insights

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

This PDF document contains a large number of links, many of which point to disposable hosting and redirectors, indicating a link farm designed to distribute malicious content. The presence of a link to a known malicious redirector and ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests a phishing or malware distribution campaign. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/strik?utm_term=plantronics+voyager+6200+replacement+earbuds In PDF document text
    • https://kibipevanisimak.weebly.com/uploads/1/3/4/7/134770361/faxij.pdfIn PDF document text
    • https://vexinafofonazes.weebly.com/uploads/1/3/1/8/131871992/vetifefokariku.pdfIn PDF document text
    • https://razamilijukiw.weebly.com/uploads/1/3/4/8/134879964/25e04.pdfIn PDF document text
    • https://titugujogimob.weebly.com/uploads/1/3/4/0/134017720/fizusetulegexa_zininuko_gimapi_poruxo.pdfIn PDF document text
    • https://tivepikilusu.weebly.com/uploads/1/3/4/7/134759048/3be061.pdfIn PDF document text
    • https://xibowawagapuj.weebly.com/uploads/1/3/1/3/131383975/sogeniv_japagirudemawig_devabagagugupe_zawazimunaxeja.pdfIn PDF document text
    • https://xovobinawulum.weebly.com/uploads/1/3/4/8/134883327/nenajifen.pdfIn PDF document text
    • https://vilamewu.weebly.com/uploads/1/3/0/7/130775649/37d6ae02.pdfIn PDF document text
    • https://munuradon.weebly.com/uploads/1/3/1/8/131859370/6172fdafb1b7.pdfIn PDF document text
    • https://kenomixu.weebly.com/uploads/1/3/0/9/130969587/lelozi.pdfIn PDF document text
    • http://wavolat.iblogger.org/78240279247.pdfIn PDF document text
    • http://kukikifo.iblogger.org/baduwa.pdfIn PDF document text
    • http://vesibigezedenu.iblogger.org/big_fishing_videos.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gakuxidufujun.rf.gd/wolus.pdfIn PDF document text
    • https://s3.amazonaws.com/pivetuzadujo/proper_arterial_line_waveform.pdfIn PDF document text
    • https://s3.amazonaws.com/xijalovelokolep/fukusewusifonulojawus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ecd136f-1bfd-465e-a2d9-f6292b9171a6/how_to_fix_fridge_freezer_compressor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/85fff74c-a182-4feb-9321-591ece422c91/woodworking_for_dummies_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d642982-2307-4eb7-aee7-a29714152c10/55096697962.pdfIn PDF document text
    • https://s3.amazonaws.com/lijulijowivaze/zubogizawenevu.pdfIn PDF document text
    • https://s3.amazonaws.com/xebuvuwov/21_day_sugar_cleanse_food_list.pdfIn PDF document text
    • http://fugiwebagatikog.rf.gd/business_corporations_act_ontario.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ee1c27e-33d6-46fd-b3e5-433c9fd4ac3d/38394244469.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1cecc749-b0df-43f2-994b-20fde1a3d7dc/the_portable_nietzsche_epub.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f6ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6AC 2960 bytes
SHA-256: 00c0a141202c10936ceac8b8df9df75720096dbedde9c5fde8d9f3447cbb363c
font_01_sfnt_off0001011b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1011B 6124 bytes
SHA-256: 7daf7ca0893bd3806f02bc5e82264d562cf77e98e5afc5612445fc1b68ca8df7
font_02_sfnt_off000115df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115DF 11488 bytes
SHA-256: 00121d12087d42b57265252b39d7f35137f2fbc01db00b0a832ba66e00c99b52

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