Malicious PDF — malware analysis report

Static analysis result for SHA-256 eff7d5f4f7233d5a…

MALICIOUS

PDF

80.2 KB Created: 2021-03-21 07:45:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 104fb39e7c985d65f4a8d5b63c5b6958 SHA-1: e1fa3710171abed9365f07fbda6123734925c113 SHA-256: eff7d5f4f7233d5ab26501b1d66cd2ece40ec8c053fdb643f4bca9a1a7d894e3
186 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a link farm, containing numerous external links, with a primary URL pointing to a suspicious domain. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jottigo.ru/strik?utm_term=kriya+yoga+initiation PDF link annotation
    • https://cdn.sqhk.co/wogirujut/hdlighc/how_do_you_recharge_your_master_sword.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410217/normal_5fff4e14941ac.pdfIn PDF document text
    • https://cdn.sqhk.co/wugotiparo/33jegfQ/suer_toss_the_turtle_online.pdfIn PDF document text
    • http://tortomsk.ru/30426489691ti9qf.pdfIn PDF document text
    • http://reawolt.online/lirr_train_schedule_todayci6l0.pdfIn PDF document text
    • http://pc-remont.website/how_do_i_make_a_wordle_onlinewbmm1.pdfIn PDF document text
    • http://keto-menu.online/netidd46sf.pdfIn PDF document text
    • http://clientbluebadge.com/what_episode_of_the_vampire_diaries_does_elena_and_damon_break_upfm7ia.pdfIn PDF document text
    • http://chaptejvxz.fun/different_love_languages_explainedoepu6.pdfIn PDF document text
    • https://cdn.sqhk.co/timafewa/6gg5Phg/48892694717.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501998/normal_5fc5cc532ff5f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://1dab3517-3db0-43ff-9fd6-b65b51f65b60.filesusr.com/ugd/565485_6ddebc8ded144f38a32004bf6c3afd43.pdf?index=trueIn PDF document text
    • https://a815f367-2516-4b88-9496-eed07d5c1eb7.filesusr.com/ugd/665c20_c226a63087cb455ba6a01ef186a522b6.pdf?index=trueIn PDF document text
    • https://fe426b01-1dd0-498a-b08e-7ec37e320b94.filesusr.com/ugd/6b45f0_62aa216f2f57460fbc987bd896517509.pdf?index=trueIn PDF document text
    • https://d1897088-ef6e-4b60-8303-910b4b551fc1.filesusr.com/ugd/4cfbbd_2c960baf7ced4dac9b412745df818195.pdf?index=trueIn PDF document text
    • https://793776f3-68b4-44d3-947a-596ce2c6f652.filesusr.com/ugd/4e977a_e5f6b12910384149b918851fc2711b09.pdf?index=trueIn PDF document text
    • https://1138278f-e8d0-45ef-aef3-dbdd7428ac52.filesusr.com/ugd/5be868_14631af965a144e0a1ff91845e2d02e9.pdf?index=trueIn PDF document text
    • https://04934832-22f3-474e-96de-b9d593e92251.filesusr.com/ugd/f390e7_4026f53cc2bd494aa6a5d08704d6b3de.pdf?index=trueIn PDF document text
    • https://d1e6aceb-f258-402f-b59e-92ecb386693c.filesusr.com/ugd/2cc58f_eeaac6506fb24622b539049e05fce97a.pdf?index=trueIn 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_off0000fe90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE90 4716 bytes
SHA-256: f3a7212a57b559e7101f3cd72354a8dd97fffbe4334a7996c449191f895a9d0c
font_01_sfnt_off00010eb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EB8 10944 bytes
SHA-256: 53c7f41b0a692a6c5204fa09dab6cd6e7140d725f140fc4ccff54379f32eaf9d