Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1522f31bae1f8bb…

MALICIOUS

PDF

127.2 KB Created: 2021-03-24 12:08:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 839aabc4ca4b11e91c87d2dadc4c8636 SHA-1: 892e4c9f94fbd2e5998c611c52bd9d9555eab779 SHA-256: a1522f31bae1f8bb168eb5b3011e875c7b848abfbbbeade061378cb91a82ff95
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 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://dafemum.ru/wix?keyword=broadview+anthology+of+british+literature+concise+volume+a+pdf PDF link annotation
    • https://jatilesaza.weebly.com/uploads/1/3/4/3/134316516/lodukomokoxonuwomebi.pdfIn PDF document text
    • https://cdn.sqhk.co/mutexeze/Pktjghf/pogelufu.pdfIn PDF document text
    • https://cdn.sqhk.co/vinogusi/jcjgxgc/girimuzajise.pdfIn PDF document text
    • https://sofamilases.weebly.com/uploads/1/3/5/4/135401016/01aae94525040a.pdfIn PDF document text
    • https://fitokuzigijot.weebly.com/uploads/1/3/4/6/134681543/mapidepewavazon.pdfIn PDF document text
    • https://zotorakiv.weebly.com/uploads/1/3/0/7/130739478/5674217.pdfIn PDF document text
    • https://cdn.sqhk.co/melipetoluf/Jhirij3/91316586147.pdfIn PDF document text
    • https://cdn.sqhk.co/lilavokolet/VRthgcb/feed_instagram_app_android.pdfIn PDF document text
    • https://vixixufabajuwe.weebly.com/uploads/1/3/1/1/131163632/5870899.pdfIn PDF document text
    • https://cdn.sqhk.co/fuxiwimemo/ZjeieFI/used_cars_movie_quotes.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371258/normal_6055f74b01f33.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454684/normal_6004d9536b4c1.pdfIn PDF document text
    • https://zawoxabupuw.weebly.com/uploads/1/3/5/9/135990747/zefowilasapobalupo.pdfIn PDF document text
    • https://cdn.sqhk.co/bafiweba/hjkjjie/last_day_on_raft_ocean_survival.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466366/normal_604674ce4da75.pdfIn PDF document text
    • https://cdn.sqhk.co/fofasafiwi/SBhD0OW/latigo_definicion_rae.pdfIn PDF document text
    • https://nililuwuta.weebly.com/uploads/1/3/0/7/130775375/7605898.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494429/normal_6033bd247858b.pdfIn PDF document text
    • https://cdn.sqhk.co/mamidusidozu/tjegff0/live_stream_rachel_maddow_youtube.pdfIn PDF document text
    • https://lorotorerusut.weebly.com/uploads/1/3/1/4/131452969/wosisirabediro-moxutofobidaji-geletixejovum-padot.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0001aebe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AEBE 6012 bytes
SHA-256: c52a746191c2061cfdf3594488c98443f76d1f8f46ebed0cde9dfbf29f33613e
font_01_sfnt_off0001c32b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C32B 13600 bytes
SHA-256: 0cd0febc193e5a2ccc42498d4ee2a2220440dabe6d2f22fffd187ccec5efaa5c

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