Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fcf70befe464018…

MALICIOUS

PDF

104.7 KB Created: 2021-03-19 11:01:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 628988a0500a6a8744a6f983216be187 SHA-1: 246a42657a76c291919df0545b63c46d51d899fb SHA-256: 7fcf70befe464018f9aa573e7d7e5119eddcf5761680ce294866513e47c162ba
186 Risk Score

Malware Insights

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

The file is a PDF containing a large number of external links, many of which point to disposable domains, indicating a link farm or SEO spamming operation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links. No scripts were extracted, but the PDF structure itself is indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://golowaki.ru/award?keyword=air+vessel+design+pdf PDF link annotation
    • http://akvatehnika74.ru/the_periodic_table_of_elements_coloring_bookzipwa.pdfIn PDF document text
    • https://rikumuxazomibib.weebly.com/uploads/1/3/6/0/136082685/25aa1a.pdfIn PDF document text
    • http://glawerry.online/15422759518in7e0.pdfIn PDF document text
    • http://infonewstravel.com/seizures_treatment_guidelinesd37n9.pdfIn PDF document text
    • http://sibuvre.com/clinical_pharmacology_notes7n6co.pdfIn PDF document text
    • https://zopadujebononi.weebly.com/uploads/1/3/1/3/131380983/wozaduwen.pdfIn PDF document text
    • http://kosodidaxelo.22web.org/deranezov.pdfIn PDF document text
    • http://navalny.design/560556302253m2wr.pdfIn PDF document text
    • https://lakomefolowe.weebly.com/uploads/1/3/0/7/130776578/vuzadukenudater_jakapil_wirabuliduvo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427811/normal_60394c1c723fb.pdfIn PDF document text
    • https://fobabugukejapa.weebly.com/uploads/1/3/4/5/134576868/tavuzi-xunexuwow-felabez-noretagewalejir.pdfIn PDF document text
    • http://viwizuzul.iblogger.org/14656619971.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447276/normal_5ffd0df218368.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382960/normal_5feb7f6dea169.pdfIn PDF document text
    • https://wiwetiforezopiv.weebly.com/uploads/1/3/2/6/132695432/1385726.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/a1420eaa-29e8-4042-a996-2e82ce359b60/21811530338.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5aabd9a-ba5f-48fb-9ba8-9e6019b3638b/nancy_drew_season_2_episode_4_song.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e1a7809-b0f1-43a0-873f-4b19e25bb656/control_system_engineering_by_nagrath_and_gopal_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c742effb-28b3-47e5-b93d-df31e0150293/what_is_nj_927.pdfIn PDF document text
    • http://giwofigu.epizy.com/purabezume.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6fd3b64d-5e38-4a3f-bd4c-ac2a259ed696/chess_opening_repertoire_for_beginners.pdfIn PDF document text
    • http://nipujolejorekal.epizy.com/57403539258.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5a2b8d3-80c0-4153-a0c2-a6dd129e09d7/whats_the_best_gaming_pc_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/51de6aaf-66be-4518-b278-63173ca011d2/49465526660.pdfIn PDF document text
    • http://ralepixevoz.epizy.com/buvumemawelar.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000144a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144A8 5048 bytes
SHA-256: 3a62d5e31a6ed9b4edb1161f90dc1eca9979634580fd47837f42ecd078887e30
font_01_sfnt_off000155f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155F2 12508 bytes
SHA-256: 2a8d68b076869c6c1a0623a98f8644b18beac04bede1dd2b33799b9b7285a9dd
font_02_sfnt_off00018033.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18033 16060 bytes
SHA-256: c43c81af3addadc619f1b50b0eb79006c69e58cb90abf43f7a5fbd940e22698c