Malicious PDF — malware analysis report

Static analysis result for SHA-256 5920f38de6d439a4…

MALICIOUS

PDF

66.5 KB Created: 2021-06-05 21:49:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: c1ecebd8452e72bfd9aeb00a0fdcc404 SHA-1: 73c0ac73b1d092bf232f00471576fe35b51caac9 SHA-256: 5920f38de6d439a4e33f9da30a409c1ba086a49e8ea9113a819434475625567f
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or phishing operation. The embedded URL 'https://nomylo.ru/pbw?utm_term=what+do+i+eat+on+a+sugar+free+diet' further supports the phishing lure related to diet information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9723

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://nomylo.ru/pbw?utm_term=what+do+i+eat+on+a+sugar+free+diet PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4376087/normal_6057068369217.pdfIn PDF document text
    • https://garasomebopite.weebly.com/uploads/1/3/0/7/130775476/3980173.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499317/normal_60544feb81f41.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368219/normal_601ddb6b7137b.pdfIn PDF document text
    • https://vulesavub.weebly.com/uploads/1/3/6/0/136095957/1451366.pdfIn PDF document text
    • https://xojoguxivizu.weebly.com/uploads/1/3/4/0/134096407/nelobebera_naxef_jifobaxununexeg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462708/normal_605c359fd374a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485445/normal_602eefd58bcee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450889/normal_603247e36bd08.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405206/normal_6064aa69abbc3.pdfIn PDF document text
    • https://vanosejifewufe.weebly.com/uploads/1/3/0/8/130814052/romanij.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fixiguru.pbworks.com/f/bivetakexegoma.pdfIn PDF document text
    • http://vedufid.pbworks.com/f/88991579277.pdfIn PDF document text
    • http://rixepal.pbworks.com/f/how_to_put_photos_from_iphone_icloud_to_pc.pdfIn PDF document text
    • http://rajejor.pbworks.com/w/file/fetch/144603750/black_swan_green_david_mitchell_summary.pdfIn PDF document text
    • http://fevawigo.pbworks.com/f/gitururo.pdfIn PDF document text
    • http://wiwedano.pbworks.com/w/file/fetch/144419271/ligemutidavifasawozolirim.pdfIn PDF document text
    • http://volikedejefa.pbworks.com/f/11319119904.pdfIn PDF document text
    • http://fudejob.pbworks.com/f/meals_a_day_diet_plan.pdfIn PDF document text
    • http://mukonisu.pbworks.com/w/file/fetch/144449415/how_to_turn_on_bluetooth_on_skmei_watch.pdfIn PDF document text
    • http://redelaw.pbworks.com/f/jozibenegejoju.pdfIn PDF document text
    • http://kivotin.pbworks.com/w/file/fetch/144676371/47646971108.pdfIn PDF document text
    • http://wipadewor.pbworks.com/w/file/fetch/144670716/how_to_speak_like_a_black_gangsta.pdfIn 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_off0000ce55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE55 5148 bytes
SHA-256: c29ebd34c1de7524989f8e3af0591706cd10189c2b523900580a42cd935af8b8
font_01_sfnt_off0000dfe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFE1 10748 bytes
SHA-256: 6822fc7dad876ed2f29ff5a0a2005e564937102897eb436b9c3a923247ddf139

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