Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc0b4a01a89aa523…

MALICIOUS

PDF

74.4 KB Created: 2021-04-05 04:03:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 718b250c2b1ebaca670b954dbdc79c32 SHA-1: 6f3d0fa4d4b8dd1b77bbf20fe16f4a57dc7ae6cb SHA-256: dc0b4a01a89aa52359fb89a08a2a3436808c0a7f9c7ab956075730e7360fe2f0
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with malicious document delivery, often involving obfuscated JavaScript or embedded exploits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=how+many+oz+in+a+small+sonic+shake PDF link annotation
    • http://deliwubavamir.mypressonline.com/person_centred_care_definition.pdfIn PDF document text
    • http://jezoxegodugorol.22web.org/papawaluvex.pdfIn PDF document text
    • http://tomogorman.com/891759293768t0oa.pdfIn PDF document text
    • http://vashmaster.info/business_analyst_jobs_no_degreegkd0b.pdfIn PDF document text
    • http://alcexpress1.xyz/plantronics_backbeat_fit_2100_specsvy4gk.pdfIn PDF document text
    • https://powipasime.weebly.com/uploads/1/3/4/7/134725879/vopivufezavorus-melurawufasima-tozotifo.pdfIn PDF document text
    • https://visopitolunew.weebly.com/uploads/1/3/1/4/131483219/3402809.pdfIn PDF document text
    • https://fewurigog.weebly.com/uploads/1/3/0/9/130969621/8724391.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://5c2df1de-05ea-4e17-9aa3-38adc7ce3153.filesusr.com/ugd/ddd609_dd60293bc4d2490da9fffc9d84fb3047.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/157c0ecb-9935-4666-8870-4e47120b28e6/ap_music_theory_test_date_2020.pdfIn PDF document text
    • http://bidavavaxekize.epizy.com/tanedulinexapidegovep.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b76e2ef-6cbb-4536-b470-f6491c04768f/nizakixupikojexuwokonel.pdfIn PDF document text
    • https://3c8197b3-f999-4f29-b3da-fbdfea3dbf34.filesusr.com/ugd/0047a4_d105d8031af94e7a947c111e3dd866bf.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c0292a8-3c51-4d81-bf06-1cdde2ea2a71/3210284571.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60a75fa2-0f84-46b1-b5f4-d05a207b3a91/furug.pdfIn PDF document text
    • http://fusozevukatamir.atwebpages.com/39369474249.pdfIn PDF document text
    • https://9e9203d9-9f5b-42f2-a849-05e42d741f90.filesusr.com/ugd/3527d5_cff443bfe048429c9241781abf25e9fb.pdf?index=trueIn PDF document text
    • https://b40f07b9-a98f-42b6-a6e2-5dc2c82ebb0e.filesusr.com/ugd/e949ea_678c8cec7f6944fe8275b2e2cd735011.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0c4457b-6a64-484d-a8fd-6934976169f4/brother_lx_3125_price.pdfIn PDF document text
    • http://sebokegekesuded.atwebpages.com/atomic_theory_test.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_off0000e2fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2FA 5212 bytes
SHA-256: e5ba3ea8ae1ada415bb60538a7ee7a4938f75c6a1eb3265e37d8ab019a7a0d17
font_01_sfnt_off0000f4a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A9 11208 bytes
SHA-256: b621783e28805f069ccb0e84e3e4a608cb31e8f28eb6ebd2674cd2511f586bdd