Malicious PDF — malware analysis report

Static analysis result for SHA-256 39be76a03e048ac8…

MALICIOUS

PDF

78.5 KB Created: 2021-05-19 16:32:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d7e755b863c86eae0e3c9f3794428d93 SHA-1: 4136b05f5ffdb0875ed1e06c0f0d41e66f5d200b SHA-256: 39be76a03e048ac843a9395d8c3d2ef3f98d47fddfbf06bc708b3b7890aa9cf6
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, suggesting a link farm or phishing attempt, with one prominent URL pointing to a 'Coreldraw suite 2019 keygen'. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or malware distribution scheme, likely leveraging social engineering to direct users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://druttle.ru/strik?utm_term=coreldraw+suite+2019+keygen
    • https://cdn-cms.f-static.net/uploads/4385863/normal_606a2b742812b.pdf
    • https://cdn-cms.f-static.net/uploads/4389080/normal_600b48a3412c3.pdf
    • https://repositugi.weebly.com/uploads/1/3/0/7/130738607/af3320f979fc.pdf
    • https://static.s123-cdn-static.com/uploads/4484623/normal_5ff3b3b7571b6.pdf
    • https://lelusujizuzu.weebly.com/uploads/1/3/1/4/131438438/9158442.pdf
    • https://cdn-cms.f-static.net/uploads/4386852/normal_602eb5252b8cf.pdf
    • https://vomakitiba.weebly.com/uploads/1/3/1/3/131384058/6085.pdf
    • https://kitopelok.weebly.com/uploads/1/3/4/3/134355781/92ef3fa10e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/gotijejaj/48828434549.pdf
    • https://uploads.strikinglycdn.com/files/1936a5bf-f01b-4975-bfb9-0ffc622402df/how_many_calories_in_a_12_piece_chicken_nugget_from_chick_fil-_a.pdf
    • https://s3.amazonaws.com/nitajosasa/tug_of_war_weight_classes.pdf
    • https://uploads.strikinglycdn.com/files/31d94a29-5773-49c3-8bd3-a9a75975e00c/75083741461.pdf
    • https://s3.amazonaws.com/mukut/55374666918.pdf
    • https://s3.amazonaws.com/dinilederu/mercedes_e320_cdi_service_d.pdf
    • https://s3.amazonaws.com/xefezesebusu/kufijanokabatogovunu.pdf
    • https://uploads.strikinglycdn.com/files/f833b757-7624-4087-8ae4-8c9976825299/67080319449.pdf
    • https://uploads.strikinglycdn.com/files/0c05ef91-48fd-40c4-8926-2e17d4c53471/rodalapibepiduzaxep.pdf
    • https://uploads.strikinglycdn.com/files/e29a84e3-5797-46fb-a75c-9e09a1763cfc/hit_refresh_satya_nadella_espaol.pdf
    • https://s3.amazonaws.com/pilazi/attack_on_titan_season_4_episode_6_release_date_philippines.pdf
    • https://uploads.strikinglycdn.com/files/8370502b-ce33-4d81-a2ec-ee0328ccc42c/best_harry_lorayne_memory_book.pdf
    • https://s3.amazonaws.com/zurovajij/809476373.pdf
    • https://uploads.strikinglycdn.com/files/0c0c9544-c865-4083-a1b2-127403fa5063/why_is_aint_i_a_woman_important.pdf
    • https://s3.amazonaws.com/fedojigudaj/ninemirezipokawan.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_off0000f08d.bin
6f55adc359d6eb5afb3ac83d7d020e30fa827ca64c3ef889767dec9c8ccf7bd3
pdf-font-stream PDF embedded font (sfnt) at offset 0xF08D 5640 bytes
font_01_sfnt_off000103e4.bin
0e1d4e09f1a08f6670ca99f9b2e0773df78bdbc8967965da24895c68ca8b6b5e
pdf-font-stream PDF embedded font (sfnt) at offset 0x103E4 11448 bytes