Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbb26a4b60e2f5cc…

MALICIOUS

PDF

78.3 KB Created: 2021-03-23 23:51:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: e2b5230c8455a6ffac0f622d5e80caf4 SHA-1: c20008c1cf5698c16b49c1b299c99a436c83a704 SHA-256: dbb26a4b60e2f5ccdb30dbb17c1a17d1f499c31c0335a2f29b9b40ffa4f076d9
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the presence of numerous embedded URLs, many pointing to disposable hosting and utilizing UTM parameters, which are common tactics in phishing campaigns. The document body, though heavily obfuscated, contains references to wkhtmltopdf and creation dates, suggesting it was programmatically generated to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://nipisod.ru/strik?utm_term=how+to+make+poetry+book PDF link annotation
    • http://newyearshop.site/lux_support_guide_s9z2n6l.pdfIn PDF document text
    • http://wordsidepost.top/sefomuzegiranenusorixaq59lu.pdfIn PDF document text
    • https://cdn.sqhk.co/besuduxikuvo/ici1Ych/rip_1st_prize_math_teacher_playtime_mod_apk.pdfIn PDF document text
    • http://opendouche.xyz/lg_true_balance_washing_machine_top_loadsqv7n.pdfIn PDF document text
    • https://cdn.sqhk.co/xeloxilava/VjghajZ/tulelejifit.pdfIn PDF document text
    • http://zoputezigup.iblogger.org/what_is_iso_9004_definition.pdfIn PDF document text
    • http://copytoshka.ru/sportline_duo_watch_battery_replacementccy4y.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/53cc153e-0e55-4304-a457-3604e9ab8d11/filogajuvas.pdfIn PDF document text
    • http://tenasupufowok.epizy.com/muwugitavofufaxulus.pdfIn PDF document text
    • http://jefevuxivux.epizy.com/du_b._el._ed_online_form_2019.pdfIn PDF document text
    • https://ffb80149-315c-4936-8637-e87477b606fc.filesusr.com/ugd/e7410d_f1aeaaae847f4f5ebc0b76ee58b0f814.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2f7fb12-9e51-4a14-a676-dd20dd72025a/sims_3_expansion_packs_tier_list.pdfIn PDF document text
    • https://40785fcd-1e5e-4316-9306-5db1d5795eae.filesusr.com/ugd/2f07a1_b1f1b6d5a0a9411081d84ae25945e33e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0cc0a8c-a34f-4e2d-8dbb-daeb6aa6681e/rofizajevobewepujem.pdfIn PDF document text
    • https://f9c380c0-3c9a-404e-8c76-a924832b335c.filesusr.com/ugd/9c8fb9_13484ec2c371434e809fb223e24f32ad.pdf?index=trueIn PDF document text
    • http://gupexofuvesok.epizy.com/gututixowa.pdfIn PDF document text
    • http://nogosos.epizy.com/terraform_aws_s3_bucket_object_region.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A6 5116 bytes
SHA-256: 8fd9f77ca31726bdfc798ffd26ec6a92f50b14290426ecaaca672a73d75c73f5
font_01_sfnt_off00010703.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10703 10992 bytes
SHA-256: 061b5c13cf0fe5808fc2da791fc504d0e226e68b3c8fa89d09b981368ff79e9b

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