Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a550d6f12f7b268…

MALICIOUS

PDF

70.3 KB Created: 2021-05-31 03:41:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-28
MD5: e72443a4c6343c1f44daa4f5fa2e8beb SHA-1: 49d4daa17547779ab7f5015c8fef21b50069c3c3 SHA-256: 8a550d6f12f7b2687c332c6b55707c55609a2e1eee18bd82319a32569e70dbdb
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm and detected as malicious by ClamAV and an ML classifier. It contains numerous external links, many pointing to disposable domains, suggesting an attempt to manipulate search engine rankings or redirect users to malicious sites. The presence of embedded URLs and the overall structure strongly indicate a phishing or SEO spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://leonvi.ru/strik?utm_term=comparative+and+superlative+exercises+6th+grade PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4417403/normal_601ebbd1c96c6.pdfIn PDF document text
    • https://towizitubozabo.weebly.com/uploads/1/3/5/4/135400713/1918151.pdfIn PDF document text
    • https://mixuvuweti.weebly.com/uploads/1/3/1/4/131483588/7801094.pdfIn PDF document text
    • https://geroguvipem.weebly.com/uploads/1/3/4/4/134465684/zewufomizijurop.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378381/normal_603b7a01b4549.pdfIn PDF document text
    • https://ronunute.weebly.com/uploads/1/3/1/0/131070227/xigipemaremigof.pdfIn PDF document text
    • https://tazififodokufu.weebly.com/uploads/1/3/0/7/130776891/4078127.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462066/normal_600fae1e5b16d.pdfIn PDF document text
    • https://xekezasutix.weebly.com/uploads/1/3/4/5/134597126/9264344.pdfIn PDF document text
    • https://zomimodobi.weebly.com/uploads/1/3/0/7/130739583/99cef90e5c8.pdfIn PDF document text
    • https://parimuxuroz.weebly.com/uploads/1/3/2/6/132682994/1204672.pdfIn PDF document text
    • https://lorudopop.weebly.com/uploads/1/3/4/3/134315835/1232716.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/34a9c08b-7e64-461c-8c53-096f81fa9328/vawodutadagopota.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/99ae77cc-ce7b-4b02-9066-a58573b59f56/gubifawovedovunogupitujor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93cb1e7c-9950-4e64-a264-01292a810440/pujaxipaku.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b318b5b-bafa-42f7-bdf6-a8bb0befd141/real_book_bass_clef_sixth_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a084d7ea-6275-4530-beb7-37e6c010ec34/beretta_a300_outlander_wood_20_gauge.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d5c9f26-4b0a-47ca-aa63-e1224ed478f6/89011677092.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a86db2df-ce9a-4adb-b5f9-c5b293010a31/how_do_you_handle_stress_interview_question_nursing.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50ad42e1-1766-40f0-96e2-702913e3c666/wuvapukuvibe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c050989-de2d-46ce-8449-594b869b54c7/twilight_new_moon_novel_online.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_off0000d44c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD44C 5676 bytes
SHA-256: 719598759251d34a0d9b4b6cdb3df8e9c203a81fb2bbefb27c20638710bb457f
font_01_sfnt_off0000e76e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE76E 10044 bytes
SHA-256: 2c1c1f12cd3467c34eb15f91bd7cb0aa22c6c1bdf5fc461cccd53e4e2e3e0df8