Malicious PDF — malware analysis report

Static analysis result for SHA-256 37027ae9fdc58c2e…

MALICIOUS

PDF

82.3 KB Created: 2021-05-19 08:50:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 938026d43b03e480d144ad80b48863f5 SHA-1: 9176346ed96cc49711702115e986477514dfceea SHA-256: 37027ae9fdc58c2e713a45c30bf7605661351858c6ba86c464898e0094e949ac
156 Risk Score

Malware Insights

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

The PDF contains a link farm and a suspicious URL, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document's content, though partially garbled, appears to be a lure related to housing rebates, designed to trick users into clicking the embedded malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://mezovuduw.ru/strik?utm_term=gst%252Fhst+new+housing+rebate+application+for+owner-built+houses
    • https://static.s123-cdn-static.com/uploads/4501634/normal_5fdd5ea2a9f75.pdf
    • https://mogiwivimar.weebly.com/uploads/1/3/4/7/134731652/wonufepajuzoxe.pdf
    • https://tiwibuvemugijaj.weebly.com/uploads/1/3/0/7/130776889/wokukex_fujekoren_libuwuvado_zexoxiv.pdf
    • https://cdn-cms.f-static.net/uploads/4373511/normal_602f80a689ca6.pdf
    • https://cdn-cms.f-static.net/uploads/4477886/normal_606c00d21e0b2.pdf
    • https://cdn-cms.f-static.net/uploads/4484804/normal_5fe931e7814e8.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/8c285be3-cf03-444c-929e-acc2177af17c/janur.pdf
    • http://jawigunomuj.epizy.com/vibajigibudadup.pdf
    • https://uploads.strikinglycdn.com/files/98cb20fa-1856-48c4-81c5-498ce530d102/pivewutada.pdf
    • https://s3.amazonaws.com/mukut/what_are_the_training_requirements_for_a_navy_seal.pdf
    • https://s3.amazonaws.com/xabalaru/music_for_vlogs.pdf
    • https://s3.amazonaws.com/muwemivumazulax/69551677232.pdf
    • https://uploads.strikinglycdn.com/files/713b5608-af7e-427b-bdc6-71758b6d165e/82854966772.pdf
    • https://s3.amazonaws.com/tesasubawalozan/95047589424.pdf
    • https://s3.amazonaws.com/kegubinefuda/zogizuxibozoxogopufovuxe.pdf
    • https://s3.amazonaws.com/kimone/60034487199.pdf
    • https://s3.amazonaws.com/sowewazulejewi/diary_of_a_wimpy_kid_2020_trailer.pdf
    • https://s3.amazonaws.com/fewifuwu/career_path_software_engineering.pdf
    • http://sufalilisep.rf.gd/reroxosip.pdf
    • https://s3.amazonaws.com/jalasilunaz/ielts_listening_2019_with_answers.pdf
    • https://uploads.strikinglycdn.com/files/69a64f75-025f-4be6-98aa-069ea361fff8/zetusipejekesevimobitalu.pdf
    • https://s3.amazonaws.com/jewizopukuni/46227591542.pdf
    • https://uploads.strikinglycdn.com/files/e22da203-eeb8-4600-8709-8d4fd5627ab0/a_simple_favor_review_no_spoilers.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_off0001005c.bin
045dcd4068539b7ea61ba0a863a4cb7bbab0243a9f3db6d79d05b338c778f7fd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1005C 5608 bytes
font_01_sfnt_off00011393.bin
67112a78f8c0306697e3db2cb117183204f2128a40f308685e27617f17d60822		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11393 11720 bytes

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