Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1bb17d37a49a23d…

MALICIOUS

PDF

124.0 KB Created: 2021-03-17 06:19:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: aba0c1cc6d5335b2bfe765f0ef55a170 SHA-1: 9e4f1bae159416b2be7b2f613490e5e40d22b9c0 SHA-256: b1bb17d37a49a23ddfb76a6afdadbedc0c81aecb82fbcac45cc53631daee366e
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm likely used for SEO manipulation or to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, with the PDF_SEO_LINK_FARM heuristic identifying it as a non-clustered link farm on disposable hosting. While no scripts were explicitly extracted, the presence of embedded URLs and the overall structure point towards a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://nipisod.ru/wix?keyword=jack+benny+show+cast PDF link annotation
    • http://usejus.club/medieval_2_total_war_factions_guideqblyy.pdfIn PDF document text
    • http://bitcoinlearningcentre.online/196985911214qyym.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417531/normal_6030d3da1639d.pdfIn PDF document text
    • http://wojesukuzak.mygamesonline.org/zonigot.pdfIn PDF document text
    • https://wudivaju.weebly.com/uploads/1/3/4/7/134762352/1345596.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382790/normal_5fccce11a1c8b.pdfIn PDF document text
    • https://lonumuzab.weebly.com/uploads/1/3/4/2/134234730/zoxeneju-fazimalewe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411944/normal_5fedf2163154f.pdfIn PDF document text
    • http://tohld.in/pipovegirofifamoxewodes1h0xs.pdfIn PDF document text
    • http://uptodate.site/fleck_5600sxt_64_000_grain_water_softenerjhrqs.pdfIn PDF document text
    • https://lufuneliza.weebly.com/uploads/1/3/2/6/132682735/xinajukej.pdfIn PDF document text
    • http://palubofapejuraw.mywebcommunity.org/xomaraxurat.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491164/normal_600d60d34f6e9.pdfIn PDF document text
    • https://mekowisegopoju.weebly.com/uploads/1/3/5/9/135963570/2273321.pdfIn PDF document text
    • https://virigegeke.weebly.com/uploads/1/3/2/7/132740897/bubafatawezinefataro.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/14456cee-542e-425d-be9a-da8dd9ac3b96/how_to_use_sentry_safe_combination.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e85ffc4d-31b1-41d6-a994-3394ee456699/livewire_ts_error_code_10028.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe9c70b2-8bde-4ded-8c2d-4cc48faad68e/2009_dodge_avenger_sxt_specs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b37bbc1-febd-492a-84dd-3ff4f4a85b39/how_to_start_a_craftsman_leaf_vacuum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/10b3e344-3579-4acb-afd2-5c895a1d5798/wazerikesiloxabinerixa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d02cc857-4910-4f32-a33b-6952daebc7c9/81905035705.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a28ea85c-e129-40f1-b33f-072b6867a775/woniv.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_off0001a8ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A8EA 5148 bytes
SHA-256: c7301e2c48f4d73961f87061abc094342b1518e235951296c98e79de864c154c
font_01_sfnt_off0001ba86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BA86 11916 bytes
SHA-256: dbe0dd817b8a3b7c3a9f5ab8fdfce769c06167e21e667f6990b81f4f93b5906a