Malicious PDF — malware analysis report

Static analysis result for SHA-256 77478ec9c46ff783…

MALICIOUS

PDF

81.2 KB Created: 2021-04-15 12:43:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 087da4081674bf92eb154b0423c6239a SHA-1: 510e79fa0d6532b014f811378850bf6c06aee01b SHA-256: 77478ec9c46ff78354224cfe7ce59ea022ae7f94cca64d011cedf3338928ea09
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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
  • 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.
  • 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://midufefew.ru/strik?utm_term=brother+no+paper+feed+error PDF link annotation
    • https://sazejibapox.weebly.com/uploads/1/3/4/8/134863873/23f900c51f1a5.pdfIn PDF document text
    • http://bimonetejatoleb.mygamesonline.org/27685837215.pdfIn PDF document text
    • https://gadudomarun.weebly.com/uploads/1/3/4/7/134705140/1a3be1181b043.pdfIn PDF document text
    • https://genunilime.weebly.com/uploads/1/3/4/3/134344847/5119162.pdfIn PDF document text
    • https://sedozexejelem.weebly.com/uploads/1/3/1/8/131871533/xuxosanarapozen.pdfIn PDF document text
    • https://xubuvene.weebly.com/uploads/1/3/1/3/131380433/3526431.pdfIn PDF document text
    • https://bazafegaxu.weebly.com/uploads/1/3/1/3/131383427/0384fc4b831e32.pdfIn PDF document text
    • https://ratewanevunexem.weebly.com/uploads/1/3/2/6/132681210/3994728.pdfIn PDF document text
    • https://moluxoket.weebly.com/uploads/1/3/2/6/132682852/fenewinoxikizob.pdfIn PDF document text
    • http://revilokepudidu.mygamesonline.org/how_to_read_a_myocardial_perfusion_scan.pdfIn PDF document text
    • https://duxebiforup.weebly.com/uploads/1/3/4/0/134013009/xowel_gukumixemapizus_degikiz_zimoromaso.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/fefurorobumi/why_iphone_5s_battery_draining_fast.pdfIn PDF document text
    • https://s3.amazonaws.com/vexosafugunu/mikazobiziwoxikekisinemit.pdfIn PDF document text
    • https://s3.amazonaws.com/jenagubadopi/mizasupinakexobum.pdfIn PDF document text
    • https://s3.amazonaws.com/lizuseguwix/folly_beach_surf_fishing_report.pdfIn PDF document text
    • https://s3.amazonaws.com/fokapikow/becker_vacuum_pump_manuals.pdfIn PDF document text
    • https://s3.amazonaws.com/febopa/57317525722.pdfIn PDF document text
    • https://s3.amazonaws.com/fowikorejodi/futefuxoke.pdfIn PDF document text
    • https://s3.amazonaws.com/zijivevip/osrs_monkey_madness_boss_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/furunumaroxun/kiganoraj.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_off00010246.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10246 4968 bytes
SHA-256: 6155b94e414d43e1dcf404e4198255684a6144406ffaa9c5ececd0ba9a96b65d
font_01_sfnt_off0001132d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1132D 10348 bytes
SHA-256: 032a28bb2098eaac02ee5e6c53ddf67982e4245293918a16eff881c01f280ca0

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