Malicious PDF — malware analysis report

Static analysis result for SHA-256 830357679a623fce…

MALICIOUS

PDF

82.1 KB Created: 2021-03-31 20:55:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 250bafb78d526c6f675afd073fd4df04 SHA-1: bcb892233f327cd3d23b7651b1208f6b3623fac0 SHA-256: 830357679a623fce6dcbcd7cf5b891a84d2ac44069ee18d3963a5616303c1e41
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, a common tactic for SEO manipulation or distributing malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it's part of a larger malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://resalured.ru/wix?keyword=ringing+in+left+ear+spiritual+meaning PDF link annotation
    • https://maruvape.weebly.com/uploads/1/3/4/8/134854924/5321156.pdfIn PDF document text
    • https://cdn.sqhk.co/rivinodati/Phh5jd1/bawuz.pdfIn PDF document text
    • http://13millions.store/recursos_literarios_el_conde_lucanor692wr.pdfIn PDF document text
    • https://cdn.sqhk.co/nuzitomizaj/jhJhbie/xuxijunoronidafoxup.pdfIn PDF document text
    • https://cdn.sqhk.co/zeliravepuj/qhfhgoS/11952675712.pdfIn PDF document text
    • http://moreprodukti.com/who_started_the_greek_godsvzvl2.pdfIn PDF document text
    • http://coupons2020.info/what_are_some_tax_write_offs_for_small_business8nyff.pdfIn PDF document text
    • https://cdn.sqhk.co/bogulevim/0Ghe6if/kikaluteketajawir.pdfIn PDF document text
    • http://snail-case.store/avatar_game_android_appps1gv.pdfIn PDF document text
    • http://xeeewq.xyz/30073836941qwom9.pdfIn PDF document text
    • http://detonicro.website/sennheiser_ew_100_g4-me2k5125.pdfIn PDF document text
    • https://polavimiwusirew.weebly.com/uploads/1/3/2/6/132681763/8722073.pdfIn PDF document text
    • http://axacheat4.xyz/52740821093vb8xy.pdfIn PDF document text
    • https://cdn.sqhk.co/kukisigafumi/SWgcksk/kingdom_builders_hex_slot.pdfIn PDF document text
    • http://comforfemj.fun/47887039850a9ymw.pdfIn PDF document text
    • https://goxapuvuf.weebly.com/uploads/1/3/2/7/132741714/6579309.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/98f009a9-87ed-4aaf-995c-6152c6424281/reflexive_verb_french_activities.pdfIn PDF document text
    • https://s3.amazonaws.com/mufukep/xerujuta.pdfIn PDF document text
    • https://s3.amazonaws.com/ravuxudibure/goblin_sword_shadow_temple_blacksmith.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/85c4d6a9-349f-4502-8e06-319310bb66a0/la_private_investigator_license.pdfIn PDF document text
    • https://s3.amazonaws.com/bejideba/sotagifodopepuf.pdfIn PDF document text
    • https://s3.amazonaws.com/xupimaral/pirufuwuwemoxujaru.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_off0000f809.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF809 5000 bytes
SHA-256: 1fa005b20022a840a98dedae95ea2ba0a2404f13737ce2d0ecf6581a6153aac4
font_01_sfnt_off000108f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108F2 10596 bytes
SHA-256: 846551f9964df5d428917682c0133f12ddd37d8715954b3ed0b6c60622c922c4
font_02_sfnt_off00012ce5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CE5 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e