Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1eb13d75250ad80…

MALICIOUS

PDF

53.3 KB Created: 2020-03-29 09:12:54 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 13944443145ebe37f1df8fbce269ff5a SHA-1: 8895efa3e94c27c3451a72eb093d731e7ac7f812 SHA-256: d1eb13d75250ad80251fa4444a76e410756987be8e279929f0675dc3381f058f
94 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various PDF documents on different domains. The ML classifier also strongly indicated maliciousness. The document body, though partially corrupted, contains references to these URLs, suggesting the primary purpose is to act as a link farm. No scripts were extracted from this sample.

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://pameladirnberger.com/uploads/1/3/1/4/131437229/131437229.html#proporcion+aritmetica+definicion+en+arquitectura
    • http://mobilebillboardsoakland.com/uploads/1/3/0/5/130544243/poxupezapi.pdf
    • http://dikaios-legal.com/uploads/1/3/0/5/130543418/3dd22cf5.pdf
    • http://shammitts.com/uploads/1/3/0/8/130814308/5568263.pdf
    • http://mydne.com/uploads/1/3/0/4/130483248/7b8364783c.pdf
    • http://culturalmindfulness.com/uploads/1/3/0/9/130969699/219451ddda5fa7.pdf
    • http://themistt.com/uploads/1/3/0/7/130740444/beraraveto.pdf
    • http://govanmbeki.com/uploads/1/3/0/6/130639349/guxebir_jojutipafegezu_zugogasinemi.pdf
    • http://mickensevictions.com/uploads/1/3/0/5/130544938/1670973.pdf
    • http://ttslighting.com/uploads/1/3/1/3/131397997/766129491545f6.pdf
    • http://vaadrabaneiportugal.org/uploads/1/3/0/2/130289241/lamepebenili.pdf
    • http://garagedooroahu.com/uploads/1/3/1/0/131070279/2888569.pdf
    • http://highschoolenglishonline.com/uploads/1/3/0/5/130550775/ponox_nukugifuwa.pdf
    • http://vivacecharlotte.com/uploads/1/3/0/3/130379368/biranelojupa.pdf
    • http://heightcheck.com/uploads/1/3/0/9/130969169/rizowuneduxo-xarunuxewigavit.pdf
    • http://www.authentic-t.com/uploads/1/3/0/8/130873962/wakibeduduga.pdf
    • http://privatetravelcorp.org/uploads/1/3/0/5/130588444/17a95f008b8090.pdf
    • http://organicbuddies.com/uploads/1/3/0/3/130313235/jugumudapita-wadiketodu-lufefiki.pdf
    • http://lyle-sightings.com/uploads/1/3/0/5/130551795/2029059.pdf
    • http://pof-freeaddcalls.com/uploads/1/3/0/6/130639792/nejukenida.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_off00008e05.bin
14becd27bb27d84410dc6a74ecfd520caf2092d19b6a4cd0a3e1159d26f0b4d8
pdf-font-stream PDF embedded font (sfnt) at offset 0x8E05 9520 bytes
font_01_sfnt_off0000b057.bin
26dd9d8da7b1efe50856d3c2d14a44d999cda94ca6d8b4f23db6d32393cc0612
pdf-font-stream PDF embedded font (sfnt) at offset 0xB057 16072 bytes