Malicious PDF — malware analysis report

Static analysis result for SHA-256 631eadef11bc1c0d…

MALICIOUS

PDF

77.7 KB Created: 2021-03-12 21:37:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: c1f8739bf3c2f00a2e83ea6f7e67bb36 SHA-1: 209ff374e5c12e5bb2571fb499ed80638f401094 SHA-256: 631eadef11bc1c0dddc4c05e7d51ff9ca179a25197679d337bd8ed775fea6aa7
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://gimoguvi.ru/wix?keyword=chapter+1+introduction+to+chemistry+section+1.1+answers PDF link annotation
    • http://gamedv.design/download_zippyshare_dreezy_big_dreezexejz.pdfIn PDF document text
    • http://xigosilefonaboj.iblogger.org/74026822829.pdfIn PDF document text
    • http://top-odejda.com/17_biblical_meaning4i7fa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470698/normal_5fda945a523d7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4505839/normal_603d306184b3c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444630/normal_5fe6453b59188.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408172/normal_5fcb6438da225.pdfIn PDF document text
    • https://cdn.sqhk.co/xenekifa/ibjaogd/f1_schedule_2016_japan_espn.pdfIn PDF document text
    • https://cdn.sqhk.co/pobumepova/5idDVib/shoot_bubble_extreme_game.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367952/normal_6023e6a6a680d.pdfIn PDF document text
    • https://cdn.sqhk.co/lupobikud/h3re0hj/jivagawexu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401703/normal_604600763547b.pdfIn PDF document text
    • http://regivag.iblogger.org/11473021639.pdfIn PDF document text
    • http://kavopiluxum.iblogger.org/rsmeans_book_free_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://simumomoluj.rf.gd/django_admin_templates_missing.pdfIn PDF document text
    • http://kisuvixoj.epizy.com/imagine_dragons_believer_lyrics_video_song.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bdbf9e63-1925-4a7e-a861-12d175f0029a/gewijajenozamogaja.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/575d6dc7-97e8-44be-b2a5-daefb87f613c/acer_aspire_e15_price_in_bd.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/697d275a-6561-43d7-9d5a-607b46981706/confessions_of_an_advertising_man_book_free_download.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_off0000e6c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6C4 5464 bytes
SHA-256: 71876224fcfbd5b09c2652ed94ed23737fe444283ea8ac1b020219344c2587b7
font_01_sfnt_off0000f94b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF94B 9884 bytes
SHA-256: 2aa938125b3d4b66606d9b394b2e5eff9254412e22aaa7b9dc8568306c0c6e86
font_02_sfnt_off00011b30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B30 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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