Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d63710e209f77f2…

MALICIOUS

PDF

75.9 KB Created: 2021-01-24 14:40:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b872a1251815d51fefb5a6b1e85f8dd1 SHA-1: b60aaf9552fdf1c39cf035f47a76ec7b1c76b2df SHA-256: 1d63710e209f77f2f28fc01c6e4e664316a5580e16649a3b1d2870a5bf867696
184 Risk Score

Malware Insights

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

The PDF contains numerous external links, including a link farm, and uses lures like a download button and callback phishing pretext to trick users. ClamAV detection and ML classification strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://trafffe.ru/123?utm_term=nims+702a+final+exam+answers+2018
    • https://cdn.sqhk.co/kixobaza/helr0Cu/fazulijapavigapubajobeb.pdf
    • https://static.s123-cdn-static.com/uploads/4460682/normal_5fcb5674d07a5.pdf
    • https://cdn.sqhk.co/lakekomum/3id80ii/pronunciation_werewolf_meaning.pdf
    • https://bozadabeduli.weebly.com/uploads/1/3/4/8/134869561/luwinidozat_riwopafo_bisotizog_powuvurotikad.pdf
    • https://static.s123-cdn-static.com/uploads/4486354/normal_5ff49ac81c8c9.pdf
    • https://static.s123-cdn-static.com/uploads/4376870/normal_5ffdf133728e6.pdf
    • https://cdn.sqhk.co/gixejefi/jIgjMp4/pewdiepie_tuber_simulator_apk_hile_android_oyun_club.pdf
    • https://cdn.sqhk.co/numokafas/0jbmeYA/blood_pressure_range_by_age_singapore.pdf
    • https://jeratevi.weebly.com/uploads/1/3/0/7/130774970/5346463.pdf
    • https://cdn.sqhk.co/wujukipako/R9Uhihj/science_behind_making_ice_cream_in_a_bag.pdf
    • https://buwigare.weebly.com/uploads/1/3/5/3/135308802/5920645.pdf
    • https://kofodurulivikaf.weebly.com/uploads/1/3/3/9/133997487/tibivaj.pdf
    • https://cdn.sqhk.co/xisalaximel/diiIhjQ/puxuzegexigemul.pdf
    • https://cdn.sqhk.co/woleparos/ijaEc98/diwebeseled.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/gofiguj/algerian_newspapers.pdf
    • https://s3.amazonaws.com/bisegilupuf/vivamasosopaxikijidexup.pdf
    • https://s3.amazonaws.com/lulelepese/85475778640.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_off0000e772.bin
a7a653bfab11733ec7485257c9789b48071656d106f4d03223a69062dcb31d69		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE772 5640 bytes
font_01_sfnt_off0000fab7.bin
0f6fb54be7bec9b5874c193bd84bc9f79a85eee8778f6c950f6e2cf2c4b43436		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB7 11800 bytes

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