Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cae34c7b9d24b3b…

MALICIOUS

PDF

81.3 KB Created: 2021-05-31 07:25:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 3ee37608ab9dcb9de8750a40f43efded SHA-1: ec06a266d167c44530ae0d03b0efe5c23e6fb15b SHA-256: 7cae34c7b9d24b3b5ba52428701f040777a67ecaf920ebc907197f4008bd1387
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to disposable hosting and utilize UTM parameters, indicating a link farm designed for SEO manipulation or phishing. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution via the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://ponafet.ru/strik?utm_term=craftsman+gas+2+cycle+25cc+weed+eater+parts PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4461516/normal_600b34e4b3841.pdfIn PDF document text
    • https://renejineb.weebly.com/uploads/1/3/5/3/135322717/muvumajarilajafa.pdfIn PDF document text
    • https://ziroluberunoreg.weebly.com/uploads/1/3/4/4/134456507/fatukonewenitumesad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501514/normal_5fe892616e983.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382773/normal_600c3d1614a8f.pdfIn PDF document text
    • https://motutipe.weebly.com/uploads/1/3/4/6/134674000/tuzabarupizemin.pdfIn PDF document text
    • https://rulodewarozuw.weebly.com/uploads/1/3/4/6/134678260/kadanug.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474449/normal_602b448aee5bd.pdfIn PDF document text
    • https://rupedotumimeto.weebly.com/uploads/1/3/1/4/131482941/rifibak.pdfIn PDF document text
    • https://neseroto.weebly.com/uploads/1/3/5/3/135326238/lujokuzexus-zupuwir.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370764/normal_5fccec7028542.pdfIn PDF document text
    • https://fenivubad.weebly.com/uploads/1/3/4/4/134482284/xolataka.pdfIn PDF document text
    • https://bilobusi.weebly.com/uploads/1/3/4/8/134872308/bizedamar.pdfIn PDF document text
    • https://pegejajala.weebly.com/uploads/1/3/4/1/134109309/xofewoda_miponusidakerej_voroxederaxek.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/b0a7d4c6-e560-44bb-8739-f29b39c7840b/what_is_the_role_of_the_community_in_criminal_justice_system.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa5b3280-4c19-46fa-b2d1-79c0dd98b08a/31602734067.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a7ec604-5503-4d51-98b3-c43fd88667da/55436221316.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/024c8d89-b1e5-4d1f-9aa8-14e6b7d150bc/grammaire_franais_niveau_b2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/875a475b-c512-4288-aad8-afc87308cba9/what_does_norm_do_in_matlab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7095849e-7585-482f-9a38-c35f8c965bc7/in_the_reaction_n2_3h2_2nh3_what_is_the_mole_ratio_of_nitrogen_to_ammonia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0bc8eed5-d79f-412b-b78a-c1f78e72ad5f/the_wifes_story_plot_diagram.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d575ae04-41f0-4613-ba88-b171a6f9e5e5/dobiwomabatafo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6deeeb5-cc52-4348-aabe-a171778ef043/howard_gardners_theory_of_multiple_intelligences_definition.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_off0000f939.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF939 5828 bytes
SHA-256: d47d9800edefb2dc4976553b09481329df02ffd203211873928e20cde9505e10
font_01_sfnt_off00010d20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D20 12608 bytes
SHA-256: b47df713d952249e4b5fdeb7ced44bbb8662e20482ef4ae7c03bce41d6259908