Malicious PDF — malware analysis report

Static analysis result for SHA-256 b326ef780e4a8a0a…

MALICIOUS

PDF

73.4 KB Created: 2021-03-04 02:58:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8348fc592c632409b88491866b7cf818 SHA-1: e7ccb938ddab15ea1255d97d700b4c81c3b78e94 SHA-256: b326ef780e4a8a0ae390239c8b2639623de5a3baa2c6c366b3c5bf09ec4596f1
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to other PDFs, suggesting a link farm or SEO manipulation tactic. One primary URL, 'https://ponafet.ru/wix?keyword=zombie+games+unblocked+online', is presented as a lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

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://ponafet.ru/wix?keyword=zombie+games+unblocked+online
    • https://static.s123-cdn-static.com/uploads/4481522/normal_5ff60d24a62e9.pdf
    • https://cdn-cms.f-static.net/uploads/4403823/normal_603e403c2db74.pdf
    • https://cdn-cms.f-static.net/uploads/4500446/normal_603bb501b23e9.pdf
    • https://kedixusivazusug.weebly.com/uploads/1/3/4/8/134869684/lovuj.pdf
    • http://vozivovog.scienceontheweb.net/tcp_ip_model_explained_for_dummies.pdf
    • http://ribadubeko.scienceontheweb.net/p90x_legs_and_back_full_workout.pdf
    • https://static.s123-cdn-static.com/uploads/4484375/normal_5ffa2e6d4359f.pdf
    • http://gitikirazidapi.medianewsonline.com/laptop_acer_aspire_v5_touch_screen.pdf
    • https://cdn-cms.f-static.net/uploads/4530868/normal_602a38c499695.pdf
    • https://fejejupusojovif.weebly.com/uploads/1/3/1/4/131483068/3120808.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/ximupuv/pivimonix.pdf
    • https://s3.amazonaws.com/sosupejuxofedo/baby_dress_images_free.pdf
    • https://s3.amazonaws.com/salade/xapatovetusituvikom.pdf
    • https://s3.amazonaws.com/waxegatulo/criminal_record_check_vancouver_form.pdf
    • https://s3.amazonaws.com/regovadeje/petsafe_wireless_instant_fence_pet_containment_system_reviews.pdf
    • https://s3.amazonaws.com/xedewofuretujo/pes_cavus_deformity_definition.pdf
    • https://s3.amazonaws.com/pewebopufupe/68540118754.pdf
    • https://s3.amazonaws.com/kimone/flight_simulator_boeing_737_free_android.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_off0000e186.bin
e15b86110298040bb76a7c74aaa6af069b26b449c7b29c1ec01974af7c80a667
pdf-font-stream PDF embedded font (sfnt) at offset 0xE186 5324 bytes
font_01_sfnt_off0000f397.bin
ae7b7bea1553a1e78f55e739e93bf5d8b0ade5584fa902f97e0e59dc509b0721
pdf-font-stream PDF embedded font (sfnt) at offset 0xF397 10640 bytes