Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c44f4675fe15281…

MALICIOUS

PDF

74.6 KB Created: 2021-04-07 02:52:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a9649f7c9898efafa882fb197ea6b81b SHA-1: 9e3b78b9cc09d2e1ca1f3d6199fc458c05ec255a SHA-256: 2c44f4675fe15281134739344f36ff387da058505e703d5a6f825b6f1993c43f
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. The document body, though heavily obfuscated, suggests a lure related to 'completing the square worksheet answers pdf'. The presence of external URIs, including one on 'resalured.ru' and another on 'tiktokcopyrighthelpteam.com', strongly suggests the document is designed to redirect users to download malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://resalured.ru/award?keyword=completing+the+square+worksheet+answers+pdf
    • http://tiktokcopyrighthelpteam.com/will_beats_replace_my_headphonesdva47.pdf
    • http://fojukivijivik.medianewsonline.com/catch_22_joseph_heller.pdf
    • https://static.s123-cdn-static.com/uploads/4443617/normal_5fdd80d1867b0.pdf
    • http://tuzotumefakorok.scienceontheweb.net/research_data_analysis_example.pdf
    • https://cdn-cms.f-static.net/uploads/4408878/normal_603853fed97d4.pdf
    • https://cdn-cms.f-static.net/uploads/4376120/normal_605ef175b8519.pdf
    • http://vinnipoh.space/90705758737a2ryo.pdf
    • http://geloritiveda.mygamesonline.org/19703214560.pdf
    • https://cdn-cms.f-static.net/uploads/4401518/normal_60625e2170fc7.pdf
    • http://duwudivusupo.mygamesonline.org/tarawedowolidonijibeduzal.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://09972071-4174-499b-90b1-de3619f59f53.filesusr.com/ugd/d1c05f_46e6fa25869d4155a1c54e66693e359f.pdf?index=true
    • https://uploads.strikinglycdn.com/files/e36c5a74-d008-4384-b40a-83934e97b293/sipuboxapokaboripuvo.pdf
    • https://9e1e9198-0fe7-4103-8084-fdcc6befb8d5.filesusr.com/ugd/2f7815_8383071fe6534e86b9a72b023df362bc.pdf?index=true
    • https://uploads.strikinglycdn.com/files/6fa3fced-c89b-4ca8-97da-5f11426b296d/wimibanewumuz.pdf
    • https://uploads.strikinglycdn.com/files/2dc9a5a1-79fd-4727-b51b-374a562ffc40/bakudaxebamevasifetobokav.pdf
    • https://ecab545c-19d2-4654-b6ac-fb8b9749f5ba.filesusr.com/ugd/e5412a_857d9a1d4d034349a3fe8d278cdba5f1.pdf?index=true
    • http://gixopiv.onlinewebshop.net/lifoboxotisadif.pdf
    • https://uploads.strikinglycdn.com/files/da42af94-74c6-467f-8348-fbc48a3ea659/lomupa.pdf
    • https://c5c1e25b-3ca9-4f8f-aecb-0ee3b29cb37b.filesusr.com/ugd/f4fe7b_56016590e49845399fd05f362dcff7ec.pdf?index=true
    • 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_off0000e40c.bin
d389410660f8732f73dee61113129c94057b3c2628137834e07da36350611139		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE40C 5644 bytes
font_01_sfnt_off0000f71d.bin
50a5e0a81124fecaff6d893e91710fb626eee97f0c215c5436c1147404aebc2d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF71D 11100 bytes

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