Malicious PDF — malware analysis report

Static analysis result for SHA-256 7114335b9860a55f…

MALICIOUS

PDF

37.8 KB Created: 2020-06-06 08:12:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 54a1cffff09bedb047401b4b22b6d490 SHA-1: c37e731b7321f7a3e4cc7c5a870c4cd706c2e55c SHA-256: 7114335b9860a55fba179b28b45762932f953e68c38c187e6446f76eb355412c
144 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, identified as a 'PDF link farm' heuristic. The primary link points to a URL that appears to be related to exam study guides, suggesting a lure. The ML classifier strongly indicates maliciousness. The presence of numerous external links suggests an attempt to manipulate search engine results or distribute malicious content via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 6

  • 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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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 http://simplifiedretirementandestateplanning.com/uploads/1/3/0/5/130551777/130551777.html#teas+exam+study+guide+amazon
    • http://harmoniesmusicinc.com/uploads/1/3/0/4/130483863/593def31058b.pdf
    • http://bravomom.com/uploads/1/3/1/3/131381452/daa19bdef7.pdf
    • http://born2bhealthy.com/uploads/1/3/1/4/131438453/tulilepegudo_mosego_nafagezoga.pdf
    • http://sbtravelbureau.com/uploads/1/3/0/7/130739368/dalit_jizademuxut.pdf
    • http://joholmes.com/uploads/1/3/0/5/130542935/6ab96b28af874.pdf
    • http://webmail.shirebourne.com/uploads/1/3/0/5/130589342/walipufer_vereb_ziguwegumote.pdf
    • http://icupixx.com/uploads/1/3/0/8/130873825/7203051.pdf
    • http://simplifiedretirementandestateplanning.com/uploads/1/3/0/5/130551777/terms.html
    • http://simplifiedretirementandestateplanning.com/uploads/1/3/0/5/130551777/dmca.html
    • http://simplifiedretirementandestateplanning.com/uploads/1/3/0/5/130551777/policy.html
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://livevunomaz.files.wordpress.com/2020/06/simotazizopixuxogogizawog.pdf
    • https://didajumum.files.wordpress.com/2020/06/70715607448.pdf
    • https://tesosinewoj.files.wordpress.com/2020/06/lediterejopodilawosedotu.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006917.bin
96c7d037ac7e0090142f6fd6b51b7280ea4876be2da9cbb9db9fe22ad5c4e665		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6917 10204 bytes

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