Malicious PDF — malware analysis report

Static analysis result for SHA-256 a592c1e11611d764…

MALICIOUS

PDF

72.8 KB Created: 2021-01-08 13:35:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 875afd2d03bf14dc2e22de02560f62c9 SHA-1: 8397c9f8a92b08918c7ae49935b4b580655912fe SHA-256: a592c1e11611d764a079cd490d3becfbc885c5355a202a2a4de36b25c1ea75ac
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

This PDF document exhibits multiple high-risk heuristics, including a ML classifier flagging it as malicious and ClamAV detecting it as a phishing trojan. The heuristics indicate social engineering tactics like 'ClickFix' and 'Clipboard command execution lure', suggesting the document attempts to trick users into running commands via Win+R or pasting into a terminal. This is likely to download and execute a second-stage payload, as evidenced by the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 8

  • 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
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://trafficel.ru/aws?utm_term=steam_api.+dll++for+windows+10+free
    • https://bobusenig.weebly.com/uploads/1/3/4/8/134866704/weseg.pdf
    • https://ravojinukof.weebly.com/uploads/1/3/4/4/134476618/daxax-lasetajozevokis.pdf
    • https://nometiru.weebly.com/uploads/1/3/4/3/134379396/de8919758b18.pdf
    • https://cdn-cms.f-static.net/uploads/4377125/normal_5fe6ff4b730be.pdf
    • https://judozolu.weebly.com/uploads/1/3/1/4/131407514/nigenomopopafa_numuman_beloso_bakifakatu.pdf
    • https://static.s123-cdn-static.com/uploads/4462354/normal_5fc47acf348e8.pdf
    • https://pokiwaminexaga.weebly.com/uploads/1/3/1/6/131637240/99d75c687df1a.pdf
    • https://pudibapajupi.weebly.com/uploads/1/3/3/9/133986481/bb51862e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/3d645b3a-267c-4f37-a1db-70da7e34060b/porta_power_jack_accessories.pdf
    • https://uploads.strikinglycdn.com/files/e518d86c-65b9-469a-971f-f94c03d890c0/nfl_week_12_predictions_straight_up.pdf
    • https://s3.amazonaws.com/tadovu/bass_guitar_chords_free.pdf
    • https://uploads.strikinglycdn.com/files/9c042a1c-e043-4245-9b59-e8de5d7f35d0/dinosaur_attack_cards_31.pdf
    • https://s3.amazonaws.com/bezegoluzose/tixabedizalusozovaw.pdf
    • https://uploads.strikinglycdn.com/files/cfa31284-eaaf-455d-a249-34b9345e7fdb/f5_office_365_deployment_guide.pdf
    • https://uploads.strikinglycdn.com/files/428191e0-ab27-4c4d-959a-bea43ff934af/parafoxanoripokuna.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_off0000dced.bin
db52ad2e1ed2ffe4eeeb97526fd27f9bddb45e30406ffc21813be981643ff632		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDCED 5636 bytes
font_01_sfnt_off0000f02a.bin
48b282cf7a61a91d359effc45a67464ad07f9072c620326ec401cea3f325a0af		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF02A 11328 bytes

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