Malicious PDF — malware analysis report

Static analysis result for SHA-256 4554079164d3abc1…

MALICIOUS

PDF

81.9 KB Created: 2021-02-18 19:13:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 62833221b82bbcf80d99b57f2a13d13d SHA-1: 9bac9db5d377edf0f435eb9f155b6983f0990fad SHA-256: 4554079164d3abc12f3560d18d90e71047ca0fd14224fa8fcec1f4bc8283e5d9
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains numerous external links, with a critical heuristic identifying it as a brand-impersonation credential phishing lure, specifically impersonating Microsoft. The presence of multiple PDF link farm heuristics and a high ML classifier score further support malicious intent. While no scripts were directly extracted, the PDF structure and link farm suggest it's designed to redirect users to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://miwimuwal.weebly.com/uploads/1/3/0/7/130775744/4704361.pdf.
  • 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/123?utm_term=how+many+years+to+become+an+information+technology+specialist PDF link annotation
    • http://pusikoxelumide.iblogger.org/gabefafeserududasu.pdfIn PDF document text
    • https://cdn.sqhk.co/navozaxezini/bvgijeG/xuwedadepe.pdfIn PDF document text
    • https://miwimuwal.weebly.com/uploads/1/3/0/7/130775744/4704361.pdfIn PDF document text
    • https://cdn.sqhk.co/govazilose/0VM3ist/bojefogufofulalezazexofa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463277/normal_5fd165f50d9a4.pdfIn PDF document text
    • https://cdn.sqhk.co/diwiporeb/zih5dsy/53800670856.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422877/normal_601702c6748e2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383567/normal_6025780a79ad4.pdfIn PDF document text
    • https://cdn.sqhk.co/zasokolof/LoieOyX/recycle_cardboard_boxes_colorado_springs.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/musoxifuvitalo/fivepanun.pdfIn PDF document text
    • https://s3.amazonaws.com/lebaxa/48631306693.pdfIn PDF document text
    • https://s3.amazonaws.com/ligole/24768134085.pdfIn PDF document text
    • https://s3.amazonaws.com/vaxebisapesi/ffxiv_collectables_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/desekusoxi/blue_moon_of_kentucky_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/lowebemuwojiso/abrao_de_pai_cifra.pdfIn PDF document text
    • https://s3.amazonaws.com/rimepusox/zeparogakuxufisopigefuded.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC55 5724 bytes
SHA-256: dc6a36d2336c5a89c4f3bdeb124309ce5d514c70560b359e1221b1b0ad71b076
font_01_sfnt_off0000ffbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFBF 10852 bytes
SHA-256: 30fc71444076bb201712006059e5bc7b58f5dac1e502db7dc25cf69c3497cd91
font_02_sfnt_off00012479.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12479 16204 bytes
SHA-256: 532315dfdc59b350d447ad91845dd8cc72a836e684f536ab9a4305dc5b53fb8e

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