Malicious PDF — malware analysis report

Static analysis result for SHA-256 a680f2fcb5a5451d…

MALICIOUS

PDF

71.3 KB Created: 2021-03-23 10:20:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ecfd8b9c66ed64b5de1e027a3338e7ce SHA-1: 7d86a9ea71c18e8d409eae0fd75706d29efed7fa SHA-256: a680f2fcb5a5451d182bb77866c3abb6d60ecbe27f0511976d4ac1c69513f850
116 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious Link

The PDF document contains a heuristic indicating it is a callback phishing lure, prompting users to call a number in a billing or support context. It also contains an external URI pointing to a URL that appears to be part of a link farm designed to attract search engine traffic. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a scam or phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://xezojetit.ru/strik?utm_term=how+do+i+contact+amazon+human+resources+email
    • https://suvamowifav.weebly.com/uploads/1/3/4/3/134351486/4b3995d.pdf
    • https://nezuwiwobitedut.weebly.com/uploads/1/3/4/6/134600585/xanuzege.pdf
    • http://kolegutoravi.mygamesonline.org/59217242085.pdf
    • http://pazujiz.mygamesonline.org/boxifufomabedotezipepuzo.pdf
    • https://sidutoxa.weebly.com/uploads/1/3/4/8/134886075/d6c8796a1679e.pdf
    • http://gizovivomiz.getenjoyment.net/lumosuni.pdf
    • https://pupowoxixibigi.weebly.com/uploads/1/3/1/4/131438439/xatoz.pdf
    • https://katabeguravaka.weebly.com/uploads/1/3/1/4/131407194/4065769.pdf
    • http://sugameloxufe.mywebcommunity.org/58314523392.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/0a91d7f2-d78d-42e1-a20c-79621d9644c0/banelibuzitagovu.pdf
    • https://s3.amazonaws.com/zesotat/tevirutukisajosurugasix.pdf
    • https://s3.amazonaws.com/gixirojozogufux/convert_audio_to_midi_logic.pdf
    • https://s3.amazonaws.com/divikufifir/48258987051.pdf
    • https://uploads.strikinglycdn.com/files/a4cb98e9-9eeb-4e48-a787-f56056335eeb/epson_xp_410_how_to_print_black_only.pdf
    • https://s3.amazonaws.com/tobobowu/noguxixutafobenof.pdf
    • https://s3.amazonaws.com/satuja/fojefiton.pdf
    • https://uploads.strikinglycdn.com/files/70062159-d0f2-48e4-9c08-f851c21a76aa/how_to_put_games_on_casio_fx-cg50.pdf
    • https://s3.amazonaws.com/bitizopovopaso/android_9._1_huawei_p_smart_2018.pdf
    • https://s3.amazonaws.com/divikufifir/health_immunization_form_dh_680.pdf
    • https://uploads.strikinglycdn.com/files/ead90fdf-ade8-4a1e-b823-6f89bb5d3de3/71208053005.pdf
    • https://uploads.strikinglycdn.com/files/cd02c9ad-a83d-4c96-9ea2-2eed0b64dc72/xanaju.pdf
    • https://s3.amazonaws.com/xirixepo/italy_visa_information_2018.pdf
    • https://s3.amazonaws.com/pazovugal/best_wallpaper_in_hd.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_off0000da85.bin
e2301eb059c764c8a209736800999da44954721dc6b5d0e653bc1df4970ace3d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA85 5284 bytes
font_01_sfnt_off0000ec67.bin
9cfea263f31aa60d975f92bbf5a762c58e73ade9492eb94448443dbffb994e5a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC67 10340 bytes

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