Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b5123eeca12d497…

MALICIOUS

PDF

78.2 KB Created: 2021-04-04 11:30:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 6b69df481499f30689a8831ab65f525d SHA-1: 1d30b6af901c1270dfdeb12576d1f807ceeb1b8b SHA-256: 4b5123eeca12d497cf22c6e47d8e03ba34dc4490985f1b4be5e0c0a46b1173d9
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to suspicious domains and are flagged as a link farm. One critical heuristic indicates a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains keywords related to 'visual dictionary' and 'pdf', suggesting a lure. The presence of embedded URLs and the link farm structure strongly suggest an attempt to redirect users to malicious sites for phishing or malware delivery.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/award?keyword=visual+dictionary+merriam+webster+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4449618/normal_601abe68501e3.pdfIn PDF document text
    • http://hushseo.online/dinoxkxfr0.pdfIn PDF document text
    • http://immorta-cross1.club/wusowoxarifixezesun635d1.pdfIn PDF document text
    • http://storeyou.store/rikigonavinazogejitilv3iyf.pdfIn PDF document text
    • http://trastqort.online/josujixiv12tw5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454990/normal_5ffb7bced3619.pdfIn PDF document text
    • http://it50disconto.pro/66624315752ij2h1.pdfIn PDF document text
    • http://rasprodavaika.ru/1658555476739hqv.pdfIn PDF document text
    • http://pedrons.space/gasuroxxhqdy.pdfIn PDF document text
    • http://yewes.space/how_to_fix_faucet_handle_that_comes_offlkg54.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jotigosi.epizy.com/75731075579.pdfIn PDF document text
    • https://s3.amazonaws.com/jezaxojipevu/dizejobawusolodimuxowotez.pdfIn PDF document text
    • https://s3.amazonaws.com/pokorevalaxex/lenemadumadazejolefope.pdfIn PDF document text
    • https://s3.amazonaws.com/remavuj/30039610008.pdfIn PDF document text
    • https://s3.amazonaws.com/kokesatodixon/98500119473.pdfIn PDF document text
    • http://rolaxaja.rf.gd/8206084181.pdfIn PDF document text
    • https://14864a69-2465-45da-a912-c6f78a3f99b9.filesusr.com/ugd/409ca8_476b390a853c4de9b74decb8622dc2e9.pdf?index=trueIn PDF document text
    • https://8994dc82-3839-475c-8de5-8afaa5c13229.filesusr.com/ugd/798b5e_07fe822c960a4d54bbd988e5f55eb74b.pdf?index=trueIn 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_off0000f240.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF240 5600 bytes
SHA-256: 1c0932969c86fe7044b0d4fbb740e3a0711da166e4b6e556143db35505eda7de
font_01_sfnt_off0001054d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1054D 11264 bytes
SHA-256: 89ba5e54428a72d6b489dfc34f6be8b63bf7cecc1dfd87442c5be8846919ca46

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