Malicious PDF — malware analysis report

Static analysis result for SHA-256 87daf8c4affdcd4c…

MALICIOUS

PDF

66.0 KB Created: 2021-01-13 00:48:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 275aec242e12d183202949b811cc94b6 SHA-1: 7195ac8dfc69a3882f474443b92cc8f90e94851b SHA-256: 87daf8c4affdcd4c859c4e4f3cf23747c07251a157a35372b9071203f5ab9d3e
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one specifically pointing to a 'dpc test apk' URL, suggesting a lure for users to download potentially malicious software. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafftec.ru/123?utm_term=dpc+test+apk
    • https://rimesozarabef.weebly.com/uploads/1/3/1/6/131607712/mapolekozu.pdf
    • https://lotaximadezepa.weebly.com/uploads/1/3/1/3/131379514/veweretupab.pdf
    • https://cdn.sqhk.co/girolivudafo/enIf1gi/vasexuvavotave.pdf
    • https://wesaxewotivaf.weebly.com/uploads/1/3/4/5/134578523/d2a4eaa308a.pdf
    • https://nitevugumosu.weebly.com/uploads/1/3/4/5/134526644/6373931.pdf
    • https://cdn.sqhk.co/gazejuruni/sggJjjM/primitive_survival_skills_girl.pdf
    • https://tupedofezelazib.weebly.com/uploads/1/3/4/3/134368784/gugonumu_pomobelaxu_fegixonosopa_suwolafasajagaz.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/xotomisen/bahria_university_karachi_admission_form_2019.pdf
    • https://s3.amazonaws.com/temujonuwu/ninozagakava.pdf
    • https://s3.amazonaws.com/dukexajuj/50288603722.pdf
    • https://s3.amazonaws.com/venunamazozuzo/the_organic_chem_lab_survival_manual_9th.pdf
    • https://s3.amazonaws.com/rovikibixu/analysis_of_algorithms_cheat_sheet.pdf
    • https://s3.amazonaws.com/tuzamada/carter_guide_bearings.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_off0000c67f.bin
b130a98947c61c02686f6fc173afccecaa060c2e7d32d2386fdf79835381dab3
pdf-font-stream PDF embedded font (sfnt) at offset 0xC67F 4860 bytes
font_01_sfnt_off0000d729.bin
ca7262c9793fca208e9d97a194764d436e3765a9e8062bd046927d97cc1d1b74
pdf-font-stream PDF embedded font (sfnt) at offset 0xD729 10596 bytes