Malicious PDF — malware analysis report

Static analysis result for SHA-256 d45d435b0d824784…

MALICIOUS

PDF

77.7 KB Created: 2021-03-05 05:50:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 638a376962323812f1b97f545ce4f923 SHA-1: 7c5b55a8fb87b759826f5388ca15a2abb786e45e SHA-256: d45d435b0d8247840fb9f45401dfcd06592443a66de139e6926ac8ed3f50f243
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting services, indicating a link farm or SEO manipulation tactic. The primary URL, 'https://maypoin.ru/award?keyword=how+to+buzz+cut+fade+at+home', suggests a lure for users searching for specific information. ClamAV detected this as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious, supporting a phishing or malicious content delivery pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://maypoin.ru/award?keyword=how+to+buzz+cut+fade+at+home PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4366381/normal_5fccd3970b51b.pdfIn PDF document text
    • https://wigubidukes.weebly.com/uploads/1/3/1/6/131606651/6094070.pdfIn PDF document text
    • https://domilejoxu.weebly.com/uploads/1/3/4/5/134529458/zusevopolofo_rukepekatefili_wojezojijim_befebom.pdfIn PDF document text
    • https://tepogixe.weebly.com/uploads/1/3/1/4/131437844/734296.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443809/normal_5fd614724a56e.pdfIn PDF document text
    • https://lijipowurop.weebly.com/uploads/1/3/4/3/134314174/pofuwisovo_buvuraki_juruwo_wigegexowani.pdfIn PDF document text
    • https://rabofabi.weebly.com/uploads/1/3/0/8/130813834/cb7fbc3e7fd29f.pdfIn PDF document text
    • https://mumerigowijegap.weebly.com/uploads/1/3/4/7/134771458/a91db8a0fd279.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c118e0a-1338-4c82-a9ca-f2757e62c119/will_bassinet_sheets_fit_pack_n_play.pdfIn PDF document text
    • https://76c9fb28-c10e-4950-85be-37de24a2ede8.filesusr.com/ugd/fa32a6_c4dfeb210ebc481d8b8753a40c06a601.pdf?index=trueIn PDF document text
    • https://cda84be5-0c54-4c05-8389-97bb004c798d.filesusr.com/ugd/fa9f00_524e81c06ff8410eb0533295882f110d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/43415e19-b861-4ba7-aa78-8101a6024018/jorolovegifabojade.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc83349e-3f30-4fb0-a1a9-eb8b539c3c65/all_of_the_following_are_examples_of_activity_bases_except.pdfIn PDF document text
    • https://883cd1dc-02d0-4059-8fa2-99201f92b631.filesusr.com/ugd/6166c9_9c040b5948e244689ad54cd4e2f6ed2b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1f41a76-28d4-4ab0-9d05-e4d989fd730a/what_causes_density_currents_to_form_in_the_mediterranean_sea.pdfIn PDF document text
    • https://32e47638-7206-44c1-ad53-5c6f9176402e.filesusr.com/ugd/e00742_f05a33d8a4434f879ce04e2a3953b0c8.pdf?index=trueIn PDF document text
    • https://f608bf75-187c-4b28-9621-af925c05c2b6.filesusr.com/ugd/05e3ad_18bd2c08d5aa4e448205485b41ae6131.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7583d520-5608-4178-bde6-a79c607d39fe/war_of_the_worlds_2019_streaming_australia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0fc25d19-ffcf-4fd4-a2db-140539ebfd8b/dunkin_donuts_bagel_ingredients.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b72bf4d-fbb9-468f-a246-dfa7cb964dc6/sijevuja.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_off0000f382.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF382 5196 bytes
SHA-256: 355332d6e798da023a0a2c3a3ea1d44254dfbb786bb69af18dd699b09bcf6013
font_01_sfnt_off0001052b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1052B 10548 bytes
SHA-256: ad147a3d7d778962798069475b3da7dc1709630d0eb825fc97696ec40bf1671e