Malicious PDF — malware analysis report

Static analysis result for SHA-256 10afa8703b37fcbc…

MALICIOUS

PDF

108.2 KB Created: 2020-12-31 18:58:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9902de8c543ae457dc470b1ca77d4050 SHA-1: dda2768189bc6cdbd180424cf15859253315a26d SHA-256: 10afa8703b37fcbc1385e90f146f08d1c5d31403f16ec6cc922ccfaeeac26e01
164 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for a link farm and an embedded URI pointing to 'trafficel.ru'. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, contains text related to 'casino jobs' and urgency, aligning with phishing lures. The presence of numerous external links, including one to 's3.amazonaws.com/vobuturinivi/75507950266.pdf', suggests a potential distribution or redirection mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 https://trafficel.ru/123?utm_term=san+manuel+casino+jobs
    • https://wijizavop.weebly.com/uploads/1/3/4/3/134309393/2067651.pdf
    • https://gemaxudemaxepeb.weebly.com/uploads/1/3/1/0/131070646/991f2e9e58f673.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/vobuturinivi/75507950266.pdf
    • https://uploads.strikinglycdn.com/files/47f2d562-54dd-48a4-ba8a-b377aca2ebf6/soclean_2_manual.pdf
    • https://s3.amazonaws.com/dobesogum/73223837478.pdf
    • https://uploads.strikinglycdn.com/files/eb25f01c-657e-4363-9b05-70780fda202a/do_kyung-soo_height_in_feet.pdf
    • https://uploads.strikinglycdn.com/files/78ac4233-5385-48ba-bd1a-a39dfee95d82/ghetto_wallpapers_for_free.pdf
    • https://uploads.strikinglycdn.com/files/cd084469-9dd2-41cf-a1bc-eebaa4323c48/50355093239.pdf
    • https://s3.amazonaws.com/xunilukegez/zekiwawus.pdf
    • https://s3.amazonaws.com/fapaga/for_the_love_of_act_science.pdf
    • https://uploads.strikinglycdn.com/files/38d00a28-cf47-4ae9-8621-0fdf19071175/war_of_the_worlds_musical_dvd_2013.pdf
    • https://s3.amazonaws.com/rudelazifizuvo/kajete.pdf
    • https://uploads.strikinglycdn.com/files/ac4c3217-ff9b-432b-9568-b65aeb479689/hard_reset_sony_e2104.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015455.bin
12976e649c8d8fc8b8d472035bce9d2b5216ce4f1f9742f4b695f2a10b5ff080		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15455 5168 bytes
font_01_sfnt_off000165d8.bin
a3ee23baa15a13c0cb1d6c7e8f5f4b443e8ed19f6c1a0f219958dbd6bec2070b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x165D8 13332 bytes
font_02_sfnt_off00018eb5.bin
3e97d79a589830065c4ad1e18beb1fbdbcb10eb8221da9dd58cf0e8801afffb2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18EB5 16112 bytes

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