Malicious PDF — malware analysis report

Static analysis result for SHA-256 130c0675c57949c3…

MALICIOUS

PDF

77.3 KB Created: 2021-06-03 17:07:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 421163f7300a38b16b9a21715271ec2e SHA-1: 7bd8f71356ec07306fbfc4bec0c0a7681fccda41 SHA-256: 130c0675c57949c346c7659d477d3594b782e19c07c903fb488e0a73a5bbb53c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document contains a large number of external links, many of which point to other PDF files, suggesting a link farm or redirection mechanism. The primary URL, 'https://smidgel.ru/pbw?utm_term=the+lesson+of+the+kaibab+answers+key+pdf', is presented as a lure to entice users to click, likely leading to a phishing site or a download of further malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, consistent with phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://smidgel.ru/pbw?utm_term=the+lesson+of+the+kaibab+answers+key+pdf
    • https://cdn-cms.f-static.net/uploads/4460066/normal_60b8ae1e11127.pdf
    • https://cdn-cms.f-static.net/uploads/4408476/normal_602d85846ed3b.pdf
    • https://niromegezos.weebly.com/uploads/1/3/2/6/132681660/murinusiwirifi.pdf
    • https://pijefezumiw.weebly.com/uploads/1/3/1/3/131379255/kebifojakola_woxomebojesuki_xerapavepukis.pdf
    • https://cdn-cms.f-static.net/uploads/4468536/normal_5fd3865f2c5e9.pdf
    • https://wanezevidika.weebly.com/uploads/1/3/4/5/134588498/papadagugubadukusado.pdf
    • https://fujikoxeloto.weebly.com/uploads/1/3/5/3/135307408/refukole-zalotikabipe-jelafe.pdf
    • https://static.s123-cdn-static-d.com/uploads/4408586/normal_60afe6bd85d7a.pdf
    • https://xovamiwif.weebly.com/uploads/1/3/4/0/134096018/61b6f.pdf
    • https://sosegasum.weebly.com/uploads/1/3/1/4/131437139/goxumasalitexamiko.pdf
    • https://static.s123-cdn-static.com/uploads/4386834/normal_5fe25a437a8c9.pdf
    • https://cdn-cms.f-static.net/uploads/4375355/normal_604e42c7d581f.pdf
    • https://cdn-cms.f-static.net/uploads/4476767/normal_5fe68c1a1cca6.pdf
    • https://bebekibuxa.weebly.com/uploads/1/3/5/9/135993907/gaxawigis.pdf
    • https://ruxamaref.weebly.com/uploads/1/3/4/7/134749336/aa1337431a33941.pdf
    • https://cdn-cms.f-static.net/uploads/4404124/normal_603890a68de86.pdf
    • https://zidoboxeped.weebly.com/uploads/1/3/5/3/135324118/lujaduxofenezibig.pdf
    • https://numusebitekamun.weebly.com/uploads/1/3/4/8/134871234/33d79.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://mizunebapod.pbworks.com/w/file/fetch/144471885/24083942543.pdf
    • http://kelivesas.pbworks.com/w/file/fetch/144474387/.pdf
    • http://lebunurivugu.pbworks.com/f/pitonax.pdf
    • http://liwuvedesisu.pbworks.com/w/file/fetch/144491073/arborist_study_guide.pdf
    • http://joraxakegeg.pbworks.com/w/file/fetch/144550260/when_did_bop_it_extreme_2_come_out.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_off0000ea3a.bin
a1934ade18c6945192e5da9d80ec6c776e45b0c87c45adc6b69972a3329b079c
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA3A 5476 bytes
font_01_sfnt_off0000fce7.bin
d2abb8687dc514d11b9d0ba1cac4d5eedd4cfd85c9c4b5cc36d174abddf3c465
pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE7 12528 bytes