Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c6f9ba953889d96…

MALICIOUS

PDF

112.9 KB Created: 2021-01-21 17:10:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 521d7680467ceb9fa058ee3e2722b745 SHA-1: 04dc8522b88b90d71c5700c2b129be0f8cfe5d3b SHA-256: 2c6f9ba953889d9676715b9453d8094638651e2585888bc198bb0f1b71b6183d
222 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was flagged as malicious by multiple heuristics, including a critical finding for a redirector link to 'https://yafferge.ru/aws?utm_term=kalvisolai+11+quarterly+answer+key+2018'. The presence of numerous external PDF links, many pointing to Weebly and other hosting services, suggests a link farm designed to distribute malicious content. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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
  • 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://yafferge.ru/aws?utm_term=kalvisolai+11+quarterly+answer+key+2018 In PDF document text
    • https://tunuwadubozowe.weebly.com/uploads/1/3/4/3/134363043/5960381.pdfIn PDF document text
    • https://fitarerak.weebly.com/uploads/1/3/5/3/135313257/309052.pdfIn PDF document text
    • https://cdn.sqhk.co/zixemoliz/cnlquib/rally_house_hours.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368249/normal_5f87834ec39a1.pdfIn PDF document text
    • https://cdn.sqhk.co/javeduner/epgdUOD/hero_wars_mod_apk_unlimited_money_and_gems.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443799/normal_5fa7f19465eed.pdfIn PDF document text
    • https://cdn.sqhk.co/pufowuvikij/wha8I1H/hit_radio_officiel.pdfIn PDF document text
    • https://site-1223236.mozfiles.com/files/1223236/bosch_battery_strimmer_manual.pdfIn PDF document text
    • https://site-1176633.mozfiles.com/files/1176633/year_3_english_worksheets_printable_australia.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376602/normal_5f8ddb5c1b21b.pdfIn PDF document text
    • https://site-1168118.mozfiles.com/files/1168118/tokibulokarokesebutezivag.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376599/normal_5ffdb494cf6a6.pdfIn PDF document text
    • https://site-1238908.mozfiles.com/files/1238908/android_auto_latest_apk.pdfIn PDF document text
    • https://site-1178687.mozfiles.com/files/1178687/61186400893.pdfIn PDF document text
    • https://dakubazelup.weebly.com/uploads/1/3/1/4/131454222/gosegowokisafu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/bugutaj/benzodiazepnicos_idosos.pdfIn PDF document text
    • https://s3.amazonaws.com/wifukedot/acidosis_tubular_renal_en_bebes.pdfIn PDF document text
    • https://s3.amazonaws.com/sirilagewuga/devitove.pdfIn PDF document text
    • https://s3.amazonaws.com/wujixus/tunorenupek.pdfIn PDF document text
    • https://s3.amazonaws.com/solonebosop/suwajezekipotagefanikixo.pdfIn PDF document text
    • https://s3.amazonaws.com/xapijifas/serajosavogupideravox.pdfIn PDF document text
    • https://s3.amazonaws.com/gupojakami/40035691607.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013c28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C28 5496 bytes
SHA-256: 5ba17ce81af5841d134c8f2e9f42c6f58888e7130895b34d8bacc15c9a0f8c5e
font_01_sfnt_off00014f0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F0E 8728 bytes
SHA-256: 3505311da2042e0c072899c9374f4e4b578a854d6dcaf357f8013328efd6efa3
font_02_sfnt_off00016674.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16674 13064 bytes
SHA-256: c2e2cf51f608feb136a73b2d6945d790da93dcee0cfe2ae23c8c098d2da67cde
font_03_sfnt_off0001922a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1922A 16036 bytes
SHA-256: bc1c1644e30597ae0beaac312b9749a82b64e26c109397326cdc67fdbaf2fe17
font_04_sfnt_off0001a691.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A691 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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