Malicious PDF — malware analysis report

Static analysis result for SHA-256 1aa508e62bcc8e24…

MALICIOUS

PDF

78.1 KB Created: 2021-03-20 07:44:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: f497a032bc3cf7f94749c7d93b415b4d SHA-1: 97f087b662e53ae4c52f51519815eb7d2b9ec5b5 SHA-256: 1aa508e62bcc8e24a8246207eb9b183c98d1c8c9bd581b43dd324bdba58937c7
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 0.9992

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://mezovuduw.ru/strik?utm_term=how+much+are+petroleum+engineers+paid+in+nigeria PDF link annotation
    • http://votujoleb.22web.org/movilo.pdfIn PDF document text
    • https://zorisurirumu.weebly.com/uploads/1/3/4/6/134600588/xobokaxinebasomurepu.pdfIn PDF document text
    • https://jimivisimobud.weebly.com/uploads/1/3/4/9/134901817/soder-pudatep-zopasidun.pdfIn PDF document text
    • https://botakukejase.weebly.com/uploads/1/3/4/6/134610266/6757642.pdfIn PDF document text
    • https://nejavedejelije.weebly.com/uploads/1/3/4/3/134336697/c33d8d9.pdfIn PDF document text
    • https://favimorujupufu.weebly.com/uploads/1/3/2/7/132710565/zawunubenabi-jutipumapix.pdfIn PDF document text
    • https://vemegerefawobe.weebly.com/uploads/1/3/2/6/132682093/c15be91cabe.pdfIn PDF document text
    • https://gitexapovaje.weebly.com/uploads/1/3/4/4/134464395/10218dee.pdfIn PDF document text
    • https://guxojifupu.weebly.com/uploads/1/3/1/4/131438233/5261236.pdfIn PDF document text
    • https://kaxitojuwomig.weebly.com/uploads/1/3/5/3/135302818/kebebutisedamex_bozufeludijakil.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wavedada.epizy.com/app_cloner_premium_apk_google_drive.pdfIn PDF document text
    • http://tuganireriwem.rf.gd/loctite_648_msds_sheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d477ebe1-535e-4aa6-89c6-655ae1e1b5fe/gurulikadekuvedefasusekox.pdfIn PDF document text
    • https://828c6a01-da61-4814-986a-f72e64f4f334.filesusr.com/ugd/cdfdba_0544ea97ac7a43f888618875169014b5.pdf?index=trueIn PDF document text
    • https://9db8f275-5044-409a-aa1b-3306d9dda9bd.filesusr.com/ugd/361f4b_e38ee0901b63402f8074b8366193457c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ffed7209-3434-4f43-8816-e34e9cde99b2/where_is_the_model_number_on_a_rheem_furnace.pdfIn PDF document text
    • https://dfabac9c-3a78-4d86-b112-ccf1750024e9.filesusr.com/ugd/b46e2f_b1003b1feecf4b8e914c13de862aa78f.pdf?index=trueIn PDF document text
    • https://a1d3e036-d9a1-4be1-9d2f-eedbb581cb22.filesusr.com/ugd/3ce946_64699aafdc5f4aeba537d5561f62ed99.pdf?index=trueIn PDF document text
    • http://diruxepuf.epizy.com/23509640605.pdfIn PDF document text
    • https://cfc603e6-7cd4-4c42-812b-9722deb80ae4.filesusr.com/ugd/0e9fc2_b5de40eff2de4ef5b55d904efad9537b.pdf?index=trueIn PDF document text
    • https://69cf8a46-0d3d-4b71-8fd1-93df925da18e.filesusr.com/ugd/e4064d_bcf5e262350c456b83262c0d8d4d91cd.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/30100d77-a2a8-481e-8400-23f62502b7a6/how_to_thread_needle_brother_sewing_machine.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3801d1ed-18ee-4bc4-9386-83da7a51a531/ramojanalodo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9970909-6f84-4f2c-bafd-f404b122e034/mathematics_formula_for_grade_5.pdfIn PDF document text
    • https://488c2ff9-9ff4-499e-8f11-525115e20b22.filesusr.com/ugd/8aba0c_794fbfb05e9846108206110447778156.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_off0000f1be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1BE 5540 bytes
SHA-256: 8aa396db2fb9877dde2128dee6716d3f05a864987990811cea2785d72e9b7a55
font_01_sfnt_off00010474.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10474 11208 bytes
SHA-256: 195e74a26692f9825130a9bdcaccfa9b59c813ec9ae8bdae08f748fe667a7b0b