Malicious PDF — malware analysis report

Static analysis result for SHA-256 fff9ed52c9aa0a7b…

MALICIOUS

PDF

77.8 KB Created: 2021-03-08 03:52:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: c4814cced4144c68bf65935f0a0fdc47 SHA-1: 15ffa9385216a724bbf9e1d0c0c5900d1be36ac4 SHA-256: fff9ed52c9aa0a7b0e14df11123803af736bc26533a4fbba1958479baa2620a6
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 0.9953

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://xajibur.ru/aws?utm_term=how+to+fix+a+ge+front+load+washer+that+won%2527t+spin PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4423431/normal_600600c092bc4.pdfIn PDF document text
    • https://momexifolel.weebly.com/uploads/1/3/4/3/134319719/61dbeffe4f0910.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408853/normal_600c9a48dc82b.pdfIn PDF document text
    • https://sazaburesifug.weebly.com/uploads/1/3/4/2/134265765/kiponekesazos_wazalusapu_veweki.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389820/normal_60267bbf65a0b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366341/normal_601aa1fe694ed.pdfIn PDF document text
    • https://wejapofi.weebly.com/uploads/1/3/4/5/134590092/zarumevame-tivazed-gesutavonewave.pdfIn PDF document text
    • https://lafadulow.weebly.com/uploads/1/3/4/5/134591129/6262ec101a2db2e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4502175/normal_5ffa8206de22a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422382/normal_5ff662d0d764b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373264/normal_6027bf35d3fb8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368246/normal_603f2fb4a9bbf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450138/normal_602efb3055683.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450336/normal_5fc5d093011d9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499636/normal_6017a518eaf71.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476757/normal_6030607001ede.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489601/normal_600649363c243.pdfIn PDF document text
    • https://naroxelilokatud.weebly.com/uploads/1/3/1/3/131384214/porewora_niwavuwugumuli_wanox.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407084/normal_600abc80bb641.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/mibiwivanetuj/gakovad.pdfIn PDF document text
    • https://s3.amazonaws.com/buponuwebi/cider_apk_free.pdfIn PDF document text
    • https://f444b11a-2681-4dc5-95a3-8b44753feb9e.filesusr.com/ugd/7ab50f_afc763777555405fb99aeee1b6d48de2.pdf?index=trueIn PDF document text
    • https://b70645e9-42d7-44c6-80f2-f165c8819e8d.filesusr.com/ugd/3f1130_9b756fe208304011a0f7ec90f8ebda14.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wixamupelinere/chrome_offline_installer_64_bit_free.pdfIn PDF document text
    • https://s3.amazonaws.com/nimuwet/zufabatuxuxiw.pdfIn PDF document text
    • https://s3.amazonaws.com/fekife/88597118858.pdfIn PDF document text
    • https://8fc1c2d6-49ba-4d63-8b95-0327ef2b1627.filesusr.com/ugd/1849a1_cb02bab0769a48d6891f003c3e83aeef.pdf?index=trueIn PDF document text
    • https://60659a61-a27b-47ea-8eac-a81775c62269.filesusr.com/ugd/7a7fb1_2818d81a5a3046589398449da88de487.pdf?index=trueIn PDF document text
    • https://02408c19-b9f6-4996-a596-1d5b7e46c8d3.filesusr.com/ugd/c83fdb_b949a4dab14947e18097adb3dd423224.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_off0000f377.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF377 5460 bytes
SHA-256: 498e49c88186621794764cc2bc73559b67c1de0d68db2960efbe528308e2fbdf
font_01_sfnt_off00010625.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10625 10488 bytes
SHA-256: 7f13e545b1a45478e602e99a3f89d5c830102b5c2605c3a8c6c3e53bba971a5b