Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cce9aa9bbd1b0c8…

MALICIOUS

PDF

75.5 KB Created: 2021-02-25 03:04:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: b464fcbad3cfb6c1d6bb0fdb06395e09 SHA-1: 73b158bd9dcb9795cee56ea6be8413e830d5d14f SHA-256: 7cce9aa9bbd1b0c8e36dfe2a6eaa3f8d203456a3994620e51c08ddc158c63936
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains and Weebly, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links point towards a phishing or malware distribution attempt, likely using embedded JavaScript to facilitate redirection.

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://maypoin.ru/award?keyword=murach%2527s+html5+and+css3+4th+edition+ebook PDF link annotation
    • https://xoxefalumigak.weebly.com/uploads/1/3/4/5/134527234/2513706.pdfIn PDF document text
    • http://grinallex.shop/cold_war_events_and_policies_chart_answers3me9c.pdfIn PDF document text
    • https://kibolimu.weebly.com/uploads/1/3/4/8/134872751/2834091.pdfIn PDF document text
    • http://duplicwcnj.space/word_crush_level_5513e1ig.pdfIn PDF document text
    • https://robugagemo.weebly.com/uploads/1/3/5/3/135304688/6496332.pdfIn PDF document text
    • http://beautysss.site/61584315729wfmim.pdfIn PDF document text
    • https://bogibopedazite.weebly.com/uploads/1/3/4/0/134018154/5558698233.pdfIn PDF document text
    • https://dugezuwodovapa.weebly.com/uploads/1/3/0/8/130874298/5566571.pdfIn PDF document text
    • http://bestplacefor.rest/453824590825w1rf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484365/normal_5fe880fdce727.pdfIn PDF document text
    • https://lupenasax.weebly.com/uploads/1/3/4/7/134738003/jowusetotaxibol.pdfIn PDF document text
    • http://fruktovik.com/73648523947s2otf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/luworizesupox/23602594206.pdfIn PDF document text
    • https://s3.amazonaws.com/sefukirexuwekij/barclays_mobile_pinsentry_app.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_off0000e98f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE98F 5800 bytes
SHA-256: 4e5b7ce787587d60bfe83541702f2496d3e1878c016dbb1fe37465d491ea2475
font_01_sfnt_off0000fd36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD36 10412 bytes
SHA-256: 822eab842f17b483861a16e4ae146e9cb33a00deed1273607eeedfaeede682fa

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