Malicious PDF — malware analysis report

Static analysis result for SHA-256 05a6e8cbb23945d8…

MALICIOUS

PDF

84.5 KB Created: 2021-05-30 21:02:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: b8a6da29979bd6512e5de289031cf8d6 SHA-1: b0e4c0c5d8763c231a60a40f8c1a824f5e121ffb SHA-256: 05a6e8cbb23945d830d97d6c2d23db8879f0d2bcf9ab942b798e0a6b350c8c7d
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://xajibur.ru/strik?utm_term=caster+netflix+sur+freebox+revolution PDF link annotation
    • https://lelamibi.weebly.com/uploads/1/3/0/7/130738841/lafitivujo-lisor-tazuniv-dusazaja.pdfIn PDF document text
    • https://jitobogi.weebly.com/uploads/1/3/7/5/137505353/momefafibot.pdfIn PDF document text
    • https://pelepidavivi.weebly.com/uploads/1/3/1/4/131454492/zomapufuleju.pdfIn PDF document text
    • https://vowevabejera.weebly.com/uploads/1/3/0/7/130775986/31689419.pdfIn PDF document text
    • https://kijiwutexaji.weebly.com/uploads/1/3/4/6/134698992/suxefap-wudipabikux.pdfIn PDF document text
    • https://likuwiwekadu.weebly.com/uploads/1/3/1/8/131857000/b36562a2b2.pdfIn PDF document text
    • https://nalakipivexovob.weebly.com/uploads/1/3/4/3/134385055/pirobegotopizitax.pdfIn PDF document text
    • https://duzonaxur.weebly.com/uploads/1/3/4/0/134012347/butapalatav.pdfIn PDF document text
    • https://papozigej.weebly.com/uploads/1/3/1/8/131858530/jajukazo_bezod.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/ada09f8e-b629-4270-a272-4bb66f2ef9ab/kurtlar_vadisi_pusu_3.sezon_1.blm_izle.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/884c4d3e-83f9-4f76-ad9c-3f7f1aa87480/what_to_do_when_your_key_battery_is_low.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b56a3994-f67b-4b85-bf85-ec723c66ebbf/ncert_physics_class_11_chapter_9_exercise_solutions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5585ea7-a7a3-4377-9181-c5c437660cb1/ross_stores_business_hours.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8bbcede3-f061-4e78-aa22-9a98dfc74540/zadowibebofudesaxiginema.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e03ee48-8cae-4b02-ac92-4d94e30f0398/thunder_cake_read_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa840463-8168-48aa-ab47-d38591be19e0/56866741311.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21be6bb6-e923-498e-a571-e490950a1e50/que_tipos_de_organizadores_graficos_hay.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7b3a9f2-73d9-40d1-bce2-81b3a0f72b9f/58546510505.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2a5ae94-6f44-4332-b72c-21d3ad48bf0c/55282878863.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9fd6e896-ff26-40fb-8846-f2fd00e9c2a3/how_to_write_a_resume_summary_with_no_job_experience.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eea63276-6cf0-4208-91f1-5a024d9da57c/the_woman_in_cabin_10_plot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe0bd3d1-562f-4061-b459-eb35b63a34ec/arms_reach_co_sleeper_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8911232b-f362-49ed-8390-12d1da05ba8d/how_to_barre_chords_easier.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fbf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBF6 4932 bytes
SHA-256: ae0fb25896fce90b2110d6cd856ee739f8efb2b0f771313b1dd77987f21d6b16
font_01_sfnt_off00010cc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CC8 12536 bytes
SHA-256: 73c3ee7dd3507dcceb79684c555dceb4a45860b65f205f065e2294c01e39f03d
font_02_sfnt_off0001345b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1345B 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34