Malicious PDF — malware analysis report

Static analysis result for SHA-256 e14b158d3a8522e0…

MALICIOUS

PDF

79.9 KB Created: 2021-02-15 15:14:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 31cddf9e15aa7ae0d1451fc8117c0105 SHA-1: 71c9b774af5c791c1869250a3454fd57adf78968 SHA-256: e14b158d3a8522e086cadabc1c97a68687f355bac548ded3a342f3f00af03a63
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to S3 buckets and other domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://seumenha.ru/123?utm_term=power+pistol+offense+playbook
    • https://cdn.sqhk.co/wojusipi/gjfjjjd/69525603901.pdf
    • https://cdn.sqhk.co/nojedajoze/ghcjiid/22531001196.pdf
    • https://dikurowewo.weebly.com/uploads/1/3/4/8/134893632/5eb60b5362e.pdf
    • https://cdn.sqhk.co/depifozopupe/WXMSm8q/crazy_taxi_driver_south_africa.pdf
    • https://cdn-cms.f-static.net/uploads/4417429/normal_5fd0a259dfbcd.pdf
    • https://pukakiliratof.weebly.com/uploads/1/3/4/7/134768090/muzodu.pdf
    • https://cdn.sqhk.co/tobizopowebo/hccibij/fuzixogiwedebatokoze.pdf
    • https://cdn.sqhk.co/gawarebadal/jajhbbJ/word_search_puzzles_for_christmas_printable.pdf
    • https://cdn-cms.f-static.net/uploads/4416661/normal_602963b05bc90.pdf
    • https://rovagurepuj.weebly.com/uploads/1/3/1/8/131856033/26192fc89d.pdf
    • https://bugajujifupub.weebly.com/uploads/1/3/4/8/134894919/mopipobemegegirulabi.pdf
    • https://pelunukemuf.weebly.com/uploads/1/3/0/7/130776607/ff1f155f58453e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/kavalukato/aesthetic_girl_skins_for_minecraft.pdf
    • https://s3.amazonaws.com/mefonevimimix/c_template_class_multiple_definition.pdf
    • https://s3.amazonaws.com/rogugagatuf/82054251686.pdf
    • https://s3.amazonaws.com/laginekux/bollywood_new_movies_filmyzilla.pdf
    • https://s3.amazonaws.com/mudurixo/fopegumawefeloxonukup.pdf
    • https://s3.amazonaws.com/kavalukato/93969412804.pdf
    • https://s3.amazonaws.com/xupimaral/android_box_not_working_on_lg_tv.pdf
    • https://s3.amazonaws.com/jepinebawo/2_inch_3_ring_binder_spine_template.pdf
    • https://s3.amazonaws.com/legapatatezisa/fesejew.pdf
    • https://s3.amazonaws.com/fadadedezeker/kandy_kush_grow_guide.pdf
    • https://s3.amazonaws.com/fajonubinomeder/victorious_song_freak_the_freak_out.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eef3.bin
126247b955fea3e729420395744e245f863435e5330f6f4683262d61944cc36a
pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF3 5084 bytes
font_01_sfnt_off00010054.bin
f4a7c5e67888cb106227444d1c80a5c0034998a989887936d7f025f0b6048524
pdf-font-stream PDF embedded font (sfnt) at offset 0x10054 10336 bytes
font_02_sfnt_off000123a2.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e
pdf-font-stream PDF embedded font (sfnt) at offset 0x123A2 4324 bytes