Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c2f08e6cc0e9d4b…

MALICIOUS

PDF

41.6 KB Created: 2020-06-04 00:53:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cf9a089c49e9f7dd613e94d5909c7124 SHA-1: 0147da8ea7e1be4cecd23f1be99ca42126f714ce SHA-256: 7c2f08e6cc0e9d4bd77b0f1fa352f311e3c27ff041f09c61535dc9e039e73e4c
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file exhibits characteristics of a link farm, containing a large number of external links to other PDF documents hosted across various domains. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the presence of numerous external links. The embedded content, though obfuscated, also contains URLs that align with this pattern. The primary goal appears to be directing users to a wide array of potentially malicious or SEO-abused content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 4

  • 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.
  • 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 http://candleempourium.com/uploads/1/3/0/7/130776817/130776817.html#child+nn+pics
    • http://poolmonsterpools.com/uploads/1/3/0/3/130323594/9e35b867d.pdf
    • http://go-learn.online/uploads/1/3/1/4/131406852/0723369590.pdf
    • http://cpanel.legendarystrengthgym.com/uploads/1/3/1/3/131398411/7678056.pdf
    • http://educationusakazakhstan.org/uploads/1/3/0/7/130738667/5349767.pdf
    • http://thaiontheisland.com/uploads/1/3/0/5/130588295/xirolamujubom.pdf
    • http://seattleinvestmentguy.com/uploads/1/3/0/7/130776123/burixejugififenu.pdf
    • http://168.bpmtc.com/uploads/1/3/1/0/131070378/gevamomoz.pdf
    • http://jessiescanlonyoga.com/uploads/1/3/0/4/130488229/lupaseti_girosirezuloxu_lubamun_tosizarekemiga.pdf
    • http://tmlcsolutions.com/uploads/1/3/0/8/130874189/8699637.pdf
    • http://cayman.ec/uploads/1/3/1/1/131164202/lijejefi_karom_rupizefiziw.pdf
    • http://candleempourium.com/uploads/1/3/0/7/130776817/terms.html
    • http://candleempourium.com/uploads/1/3/0/7/130776817/dmca.html
    • http://candleempourium.com/uploads/1/3/0/7/130776817/policy.html
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://gefivit.files.wordpress.com/2020/06/89592830125.pdf
    • https://pobagokebojo.files.wordpress.com/2020/06/61247567441.pdf
    • https://ziboruxupebi.files.wordpress.com/2020/06/guzomuvidemebovis.pdf
    • https://xevekebi.files.wordpress.com/2020/06/89128223062.pdf
    • https://rinizipeg.files.wordpress.com/2020/06/warotasuzivolanosodiraj.pdf
    • http://hacking4impact.berkeley.edu/uploads/1/3/1/3/131384368/053851429cf05.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 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007930.bin
888c3c4ecd62797d8cfd2731dffae0caeed7bf5c2851569e6db43f3224a5e676
pdf-font-stream PDF embedded font (sfnt) at offset 0x7930 9920 bytes