Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d832ed1df5ddce1…

MALICIOUS

PDF

34.9 KB Created: 2020-03-29 08:19:57 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 9729778b2515ecca425a294c0f8e5df3 SHA-1: a212aba1a790f261087bbe4fa02e1c6602626613 SHA-256: 6d832ed1df5ddce13a7011e0c57cc2d4b3bece6c3baecc3a6d6135f1f7ee8c86
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links to other PDF files hosted across numerous domains, as indicated by the PDF_SEO_LINK_FARM heuristic. The ML classifier also flagged this PDF as malicious with high confidence. The embedded document body text appears to be obfuscated or corrupted, but the presence of numerous external links suggests a malicious intent, possibly for SEO manipulation or to serve as a distribution point for further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://benkregel.com/uploads/1/3/1/3/131378991/131378991.html#lady+in+waiting+synonym
    • http://acsnutritionfitness.com/uploads/1/3/0/2/130270963/kabedagegixum_sebat_tafanagenar_xasijupofuv.pdf
    • http://novazaco.com/uploads/1/3/0/7/130739362/4bad446.pdf
    • http://amgsupplychainadvisors.com/uploads/1/3/0/2/130272369/6511000.pdf
    • http://brandingyougroup.com/uploads/1/3/0/6/130639397/5478649.pdf
    • http://phoenixevents.us/uploads/1/3/0/7/130739223/987856b6.pdf
    • http://fozzcon.com/uploads/1/3/0/5/130588847/mosomajorixase_subetiwajitu_gokodedutovax.pdf
    • http://www.grumpysink.com/uploads/1/3/0/2/130272592/vavuginutolerul.pdf
    • http://latercomics.com/uploads/1/3/0/5/130539260/wutedodulavul.pdf
    • http://www.mdhelpmd.com/uploads/1/3/0/4/130476974/3316097.pdf
    • http://ruiboguojizenmeyang.f18.ebkf.org/uploads/1/3/0/6/130621701/zipex.pdf
    • http://www.laboisserolle.fr/uploads/1/3/0/2/130292013/rudilibumorivud.pdf
    • http://advanceapplianceservices.org/uploads/1/3/0/3/130323454/c8928d8a93d.pdf
    • http://revivetheroxy.org/uploads/1/3/0/9/130969477/cbdc7cff87.pdf
    • http://positivepushkc.com/uploads/1/3/0/4/130483276/53d93b6b2da7.pdf
    • http://hostmaster.bryanhatfield.finance/uploads/1/3/0/6/130621461/93d248160e5051.pdf
    • http://4movements.org/uploads/1/3/0/2/130291358/fetutimo.pdf
    • http://thegeeksdomain.com/uploads/1/3/0/7/130776082/4408393.pdf
    • http://businessclaimingservice.com/uploads/1/3/0/6/130603928/gadibolap-rovozanunutafep-nobemuj.pdf
    • http://whiteshieldcaregivers.com/uploads/1/3/0/9/130969700/6620972.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005a08.bin
6cf8cd24ba227bb1c305b14ed9dc9a044f01f584739e4eb0ef3cd2655e552441
pdf-font-stream PDF embedded font (sfnt) at offset 0x5A08 6740 bytes
font_01_sfnt_off000074cf.bin
dab1075ebef377275e2b45e9a301788cea1b35929fa014a3be1cbc1c3b87477d
pdf-font-stream PDF embedded font (sfnt) at offset 0x74CF 1916 bytes