Malicious PDF — malware analysis report

Static analysis result for SHA-256 989fec8c08c04cf2…

MALICIOUS

PDF

77.2 KB Created: 2021-03-12 21:01:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 0f9ad925b446d94466be972199dd873f SHA-1: 97e1887296c4cbf7e873e171523cdc6cf3dd01fb SHA-256: 989fec8c08c04cf21abd9396aac9ad05c5b4b8d66a6ded3f59033f8da5cf5ccf
186 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 0.9956

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://botokaw.ru/aws?utm_term=what+is+the+irony+in+the+yellow+wallpaper PDF link annotation
    • http://lnstagram-helping-centre.com/gozabafalekuzejejija1mtjp.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367633/normal_6047efb6e0202.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463807/normal_5fd642fedd43a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423137/normal_6038e1c5b01d3.pdfIn PDF document text
    • https://xipeluzewuwese.weebly.com/uploads/1/3/1/4/131406434/ad75ac.pdfIn PDF document text
    • https://zikivunebek.weebly.com/uploads/1/3/5/9/135964247/vuvesasavexez_mojetozopi_vopoxigev.pdfIn PDF document text
    • https://gakofalu.weebly.com/uploads/1/3/1/6/131636889/tokomi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502698/normal_6027bd58e25cf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477139/normal_6039d176cb166.pdfIn PDF document text
    • http://ooovseanalizi.ru/51137684560u91vw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401519/normal_601ceb273259c.pdfIn PDF document text
    • https://dununatanag.weebly.com/uploads/1/3/0/7/130775655/9dd85.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378827/normal_601e2cefe4789.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500665/normal_60219cb8323de.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380699/normal_5ffc9600e155f.pdfIn PDF document text
    • http://generalmassage.online/printer_driver_hp_laserjet_p1006_free_downloadweoaa.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/devuxuzejozam/canon_mx300_manual_espaol.pdfIn PDF document text
    • https://s3.amazonaws.com/toliwudalamem/facebook_video_er_online_mobile.pdfIn PDF document text
    • https://6762652a-e869-40f3-960d-1446d4066230.filesusr.com/ugd/55e6b1_37372edff45d4be7ac96d597dd2474b3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rutufokedizon/datepicker_mindate_not_working_android.pdfIn PDF document text
    • https://d9226533-59f4-4737-ae77-cfa9cdee5378.filesusr.com/ugd/d7c203_50e3b82d9afe4d178073a55da8a80cf7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zuguvoxoki/43516563645.pdfIn PDF document text
    • https://305aa2e3-e1d2-413d-aa2e-f1bb83d03ded.filesusr.com/ugd/92ee2b_b89fd5f05a694acea349cb4e9c5fa68f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/risisipajole/29515635384.pdfIn PDF document text
    • https://59e5a08b-0d8d-455f-a3a7-35a3b781ab3e.filesusr.com/ugd/784815_3311181dbd4e4a5b94d20fa3eb142349.pdf?index=trueIn PDF document text
    • https://77bc4ea4-de20-41c0-a463-a5315db628d9.filesusr.com/ugd/2c69e3_f35b93ba26b749fd8ae1a3aacfa25907.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_off0000f086.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF086 5116 bytes
SHA-256: c69fc87ffa35e7abc141fa6f4ec5c164f1040f82aa9b7bb4323225fd0050aaea
font_01_sfnt_off00010201.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10201 10680 bytes
SHA-256: 69ad626fcc199fc2df481f40174ce3e3bbb779d11d1a306a0a38c96467d1f511