Malicious PDF — malware analysis report

Static analysis result for SHA-256 668446859eb60a0d…

MALICIOUS

PDF

70.6 KB Created: 2021-04-01 09:15:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b5441a9a75bc2ac12f4024630d28b568 SHA-1: 1d01275842158ab3bb0f97ab157d605d309dfbd6 SHA-256: 668446859eb60a0d5136c105b12a2845f78a2f0bf533ee08ed228f566706edc9
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, a technique often used for SEO farms or to direct users to malicious sites. ClamAV and ML classifiers strongly indicate malicious intent, specifically flagging it as a phishing trojan. While no scripts were directly extracted, the PDF structure and external link farm suggest an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://baarspo.ru/123?utm_term=mansfield+reformatory+guided+tours
    • https://static.s123-cdn-static.com/uploads/4406228/normal_5fefed4b542bf.pdf
    • https://cdn-cms.f-static.net/uploads/4370528/normal_602e9f1c0f3c3.pdf
    • https://pelimabogex.weebly.com/uploads/1/3/4/6/134685965/6608089.pdf
    • https://cdn-cms.f-static.net/uploads/4379049/normal_601aaa0439ee9.pdf
    • https://sokirokesavosa.weebly.com/uploads/1/3/4/9/134901907/vimenusejapadexi.pdf
    • https://cdn-cms.f-static.net/uploads/4369900/normal_6015b22f4a014.pdf
    • https://bisetegu.weebly.com/uploads/1/3/4/5/134528498/5076638.pdf
    • https://cdn-cms.f-static.net/uploads/4489259/normal_60113182ae859.pdf
    • https://static.s123-cdn-static.com/uploads/4389090/normal_5ff1c24a21121.pdf
    • https://static.s123-cdn-static.com/uploads/4465025/normal_5feb4218166dd.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/476831f3-bdcd-4e9a-98ee-b6efb3a70d3b/winujobi.pdf
    • https://s3.amazonaws.com/sabegokek/60728592174.pdf
    • https://uploads.strikinglycdn.com/files/5c5b9728-ebcf-4951-abdc-4526b1ed0b84/33327935052.pdf
    • https://s3.amazonaws.com/liluvad/70675477343.pdf
    • https://uploads.strikinglycdn.com/files/95e32bd3-59b1-40d4-8f75-babbc141a108/what_is_the_desert_in_arizona_called.pdf
    • https://uploads.strikinglycdn.com/files/957d1b6d-a913-460d-bb0a-e6360412dba3/wurajoniju.pdf
    • https://uploads.strikinglycdn.com/files/aa20f8aa-f133-43cf-b87b-5f883b404db7/maytag_bravos_xl_washer_cleaning.pdf
    • https://uploads.strikinglycdn.com/files/e50c819d-ada6-43ee-8934-62d5d061b798/verb_list_in_english_and_spanish.pdf
    • https://uploads.strikinglycdn.com/files/d270c2f6-57ba-4a8d-84e1-f1d32d5d0ad9/dewalt_3000_psi_pressure_washer_wont_start.pdf
    • https://uploads.strikinglycdn.com/files/4ce82d74-d688-4997-8e21-f26108b738cc/how_much_room_for_a_shuffleboard_table.pdf
    • https://uploads.strikinglycdn.com/files/3ad7e42a-dcb2-4ef0-a815-379035dd58af/29371378865.pdf
    • https://s3.amazonaws.com/fewifuwu/great_writing_2_answer_key_4th_edition.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d6c8.bin
6a809eff317b857057c0d5aa42c56fc106423a7b4cb57506119cae2a4dcc0517
pdf-font-stream PDF embedded font (sfnt) at offset 0xD6C8 5332 bytes
font_01_sfnt_off0000e8ea.bin
7c7af22a6ba58a88f378d7d5b0704df919af1530ebad75fde0efe15a3193d4a2
pdf-font-stream PDF embedded font (sfnt) at offset 0xE8EA 10552 bytes