Malicious PDF — malware analysis report

Static analysis result for SHA-256 df42cd485e78d4d3…

MALICIOUS

PDF

88.6 KB Created: 2021-03-25 03:35:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: a24663c8cab3407eee6aa55144ad2de5 SHA-1: eb40d1b76606bb6b6db5a137e2b6a181e3f99ba2 SHA-256: df42cd485e78d4d3537dca66433df1faac4daaa2d1841e210b66c38642b8a3eb
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation scheme. The presence of numerous unknown reputation URLs indicates a high likelihood of malicious intent, potentially leading to phishing sites or malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://druttle.ru/123?utm_term=guided+by+voices+band+wiki PDF link annotation
    • http://sosiwawivijomo.scienceontheweb.net/how_to_use_skyrim_mods_ps4.pdfIn PDF document text
    • https://cdn.sqhk.co/wavagowew/ggbYGhh/86908254609.pdfIn PDF document text
    • http://xebupado.mypressonline.com/why_does_my_lg_top_loading_washing_machine_smell.pdfIn PDF document text
    • http://lawexape.mygamesonline.org/99110585235.pdfIn PDF document text
    • http://pubgucbayim.com/kababx1yol.pdfIn PDF document text
    • http://zahlungsservice-ch.site/kitefabiparyqpg5.pdfIn PDF document text
    • https://cdn.sqhk.co/xufatirumina/TAbzV03/43444030888.pdfIn PDF document text
    • https://cdn.sqhk.co/sevofibof/fhdtYNG/17840648162.pdfIn PDF document text
    • https://cdn.sqhk.co/sipebililofo/bjfjcge/multi_apps_64bit_support_library.pdfIn PDF document text
    • https://danexuxubusam.weebly.com/uploads/1/3/2/6/132695747/7144043.pdfIn PDF document text
    • http://madewithsunshine.com/xutoba6x88m.pdfIn PDF document text
    • https://cdn.sqhk.co/mevazasid/Bjhge7M/rechargeable_aa_batteries_for_solar_garden_lights.pdfIn PDF document text
    • https://cdn.sqhk.co/sovokeduseb/DgjjaQr/diy_retro_space_helmet.pdfIn PDF document text
    • https://kuxadolawemigos.weebly.com/uploads/1/3/4/7/134712866/4509409.pdfIn PDF document text
    • https://cdn.sqhk.co/dezuvosowato/ffKwE56/lapusejeninopudefof.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tajobum.rf.gd/45732668533.pdfIn PDF document text
    • http://japinoxizidunub.myartsonline.com/hemolytic_uremic_syndrome_review.pdfIn PDF document text
    • http://sakigekoxigukil.epizy.com/getemomilarujuto.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011dc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DC7 5292 bytes
SHA-256: c31eafe545040da85e7c463d645b7a79bd48cebb571b8b4d70d1d2543ac41cd9
font_01_sfnt_off00013005.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13005 10928 bytes
SHA-256: 70599e99b4861c655336caff5c0ecc7d143b9bb4c05cf33429bb24b472b15ec0

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