Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b223b21e60fa2b7…

MALICIOUS

PDF

83.6 KB Created: 2021-05-23 04:11:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a3f1369ccf0c3cba709118e081d63520 SHA-1: 28bf997ad07b104f181a206c1e7ff78d7cc5071c SHA-256: 1b223b21e60fa2b7e1a419282f64ad4e6c87ddf2237411f5065d9962cb27a73c
156 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a link farm, directing users to a URL that appears to be a lure. The document body, though heavily obfuscated, contains text related to drawing a basketball court, which is likely a pretext to disguise the malicious intent. The presence of external links and the ML classifier's high confidence score indicate a malicious phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://lozipotod.ru/strik?utm_term=how+to+draw+and+label+a+basketball+court
    • https://static.s123-cdn-static.com/uploads/4485589/normal_5fe1b543a3a0c.pdf
    • https://cdn-cms.f-static.net/uploads/4367905/normal_600a90c8aae62.pdf
    • https://cdn-cms.f-static.net/uploads/4404528/normal_6053c96de06d0.pdf
    • https://static.s123-cdn-static.com/uploads/4481990/normal_5ff08c648ea33.pdf
    • https://cdn-cms.f-static.net/uploads/4485001/normal_605f2ee41df12.pdf
    • https://lesapexif.weebly.com/uploads/1/3/1/6/131637780/88d734aa8.pdf
    • https://sopazavevorud.weebly.com/uploads/1/3/4/3/134370644/2794802.pdf
    • https://cdn-cms.f-static.net/uploads/4505820/normal_60341d76bb096.pdf
    • https://static.s123-cdn-static.com/uploads/4388274/normal_5fefdbf15fd21.pdf
    • https://cdn-cms.f-static.net/uploads/4446016/normal_6068989889001.pdf
    • https://cdn-cms.f-static.net/uploads/4460447/normal_601faedae9932.pdf
    • https://cdn-cms.f-static.net/uploads/4486351/normal_6019535ebdc6a.pdf
    • https://donibirumot.weebly.com/uploads/1/3/4/4/134463545/1702343.pdf
    • https://cdn-cms.f-static.net/uploads/4408335/normal_6060db958aa20.pdf
    • https://cdn-cms.f-static.net/uploads/4419413/normal_60490d4042112.pdf
    • https://cdn-cms.f-static.net/uploads/4403946/normal_6062b73883270.pdf
    • https://cdn-cms.f-static.net/uploads/4388824/normal_604e9be2324ee.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/e2bc989c-58d9-487f-a58b-306f9e2a4320/37137926994.pdf
    • https://uploads.strikinglycdn.com/files/ba71140b-c047-40f7-b735-1e1c5de7f4b8/can_i_replace_the_battery_on_my_dyson_v8.pdf
    • https://uploads.strikinglycdn.com/files/077c905e-fe6a-4687-a890-28119fc19c41/49228865257.pdf
    • https://uploads.strikinglycdn.com/files/d608730d-e89e-488b-918a-31fe88d05df6/spanish_stories_for_beginners.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_off0000fd0b.bin
002219a1fe30355495785e9554fc6465e9d561c735e13774b03f063f78bae784
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD0B 5024 bytes
font_01_sfnt_off00010e3e.bin
60c17520ce543276d11f68ea60f2a88788c36652139a557e8257ef5fab6770cd
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E3E 10620 bytes
font_02_sfnt_off00013273.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176
pdf-font-stream PDF embedded font (sfnt) at offset 0x13273 4324 bytes