Malicious PDF — malware analysis report

Static analysis result for SHA-256 5edb636bf959e3d5…

MALICIOUS

PDF

91.3 KB Created: 2021-03-29 06:32:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eb51b3b8355783709fe215260ee1d79b SHA-1: 2a49ba91ca5476f353c6dc46c48c8ac2d9207d12 SHA-256: 5edb636bf959e3d52efa7b2218b3d06fd653dc692fdb1b95585960d47e1c0680
166 Risk Score

Malware Insights

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

The PDF document contains heuristics indicating it is a link farm on disposable hosting, designed to lure users with promises of textbooks. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or advance-fee scams. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document intended to redirect users to potentially harmful sites.

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
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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://jumiwimov.ru/award?keyword=campbell+biology+10th+edition+online+textbook+pdf
    • http://sevezor.scienceontheweb.net/64301948537.pdf
    • https://bagirarivevi.weebly.com/uploads/1/3/1/3/131384609/madalodukuluj.pdf
    • https://cdn.sqhk.co/weruvewo/auswyid/dip_nail_designs_for_summer_2020.pdf
    • https://cdn-cms.f-static.net/uploads/4366050/normal_6013655448026.pdf
    • https://cdn.sqhk.co/kakapoxavu/bCjdIhh/rirasabofes.pdf
    • http://vazawujuzu.sportsontheweb.net/zufakatasefore.pdf
    • https://cdn-cms.f-static.net/uploads/4485457/normal_603ff61e6c4b0.pdf
    • https://nijasofefovo.weebly.com/uploads/1/3/4/7/134719995/jujevoj_kerolutuzujub_jakus_kudutifoxog.pdf
    • http://jefevivavifax.scienceontheweb.net/37271616729.pdf
    • https://bumarotijij.weebly.com/uploads/1/3/4/6/134688095/kobugo-xegobe.pdf
    • https://cdn-cms.f-static.net/uploads/4421639/normal_6026a8c6cb4f8.pdf
    • https://cdn.sqhk.co/wowixepis/phgiai8/red_robin_bird_costume.pdf
    • https://static.s123-cdn-static.com/uploads/4367674/normal_5fe445baeceb4.pdf
    • https://cdn.sqhk.co/sivunukiwe/dGBoiji/27660178056.pdf
    • https://cdn-cms.f-static.net/uploads/4417999/normal_600c2764855dd.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://keximidurowu.rf.gd/romans_commentary_easy_english.pdf
    • http://wugujub.onlinewebshop.net/72160888999.pdf
    • https://uploads.strikinglycdn.com/files/b3bcd569-d54d-452d-9498-f3f0682b979c/19204443407.pdf
    • https://uploads.strikinglycdn.com/files/542451af-cb19-461e-b27a-575b97232fc0/top_business_analytics_masters_programs_in_usa.pdf
    • http://wiwifiladovov.epizy.com/pojesilimawif.pdf
    • http://sofiveza.rf.gd/xubegifogojafizuxerevaz.pdf
    • https://uploads.strikinglycdn.com/files/98cf4c43-ceb0-4739-87f5-0be6c8c4f5b2/what_food_makes_you_put_on_weight.pdf
    • http://zopefunexot.epizy.com/dungeons_and_dragons_online_beginners_guide.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000116ee.bin
1a68ac0cef905556d7f5e19455a540ebbd4561467b6b773a17943d35f1627758		 pdf-font-stream PDF embedded font (sfnt) at offset 0x116EE 5560 bytes
font_01_sfnt_off000129c7.bin
abb24dec6b9a75c2f6d712311756b06bbae133ec84d002a834df57c96ba1f721		 pdf-font-stream PDF embedded font (sfnt) at offset 0x129C7 11692 bytes
font_02_sfnt_off00015134.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15134 4324 bytes

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