Malicious PDF — malware analysis report

Static analysis result for SHA-256 72e5e81a356ac954…

MALICIOUS

PDF

52.3 KB Created: 2020-04-27 06:50:40 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 6f07d8476832ed1da8f9971887154e24 SHA-1: 32871a24385207884e9a2b490038f6988d2c889b SHA-256: 72e5e81a356ac95416128d8a8909b6fc54edb6351fed96a6ab8d48ce86698ff7
96 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which point to other PDF files with numeric slugs, suggesting a link farm for SEO spam or to host malicious content. The document body, though partially corrupted, contains text related to 'Vietnam war map activity answers' and references the wkhtmltopdf application, indicating a potential lure. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

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://historicv.com/uploads/1/3/0/5/130590297/130590297.html#vietnam+war+map+activity+answers
    • http://keloiderbeauty.com/uploads/1/3/1/4/131437779/tijuzefopomifim.pdf
    • http://twinkletoespetcare.com/uploads/1/3/0/6/130603728/fumefezoleluxuju.pdf
    • http://thenewblueworld.com/uploads/1/3/0/7/130776106/tajofix.pdf
    • http://myrabi.com/uploads/1/3/0/3/130313221/sejaxuf_xoruzivuzasek.pdf
    • http://rd4wkdoc.net/uploads/1/3/1/0/131070481/digolewipe.pdf
    • http://hispachio.com/uploads/1/3/0/7/130776682/1747070.pdf
    • http://becomethinforlife.org/uploads/1/3/0/3/130323154/4300829.pdf
    • http://semilladecristo.org/uploads/1/3/1/4/131452818/mekawi_pelozejijebo_doraribi.pdf
    • http://2001dodgeram2500slt.com/uploads/1/3/0/8/130874437/femasavolikobusakube.pdf
    • http://wildrockwvevents.com/uploads/1/3/0/5/130550715/3299788.pdf
    • http://kcindustries.net/uploads/1/3/0/5/130550813/wukiwegu_sidabulopis_nuxifigu.pdf
    • http://mjarriolacreations.com/uploads/1/3/0/8/130814515/tufenibul.pdf
    • http://jarvisebenezer.ca/uploads/1/3/0/5/130550949/govoje.pdf
    • http://fidelitythreads.com/uploads/1/3/0/4/130435819/nulilolokaj-lulonalebeg.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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008b13.bin
dc4b12b230f81d592bf197e3cb12119ba73a2bd33dd59c952707910ecf48b7a6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B13 9348 bytes
font_01_sfnt_off0000ae51.bin
0c424d787e690d1d5ce1ca25ba1c7e90bb27562cbfb0080e2513ef8020cde74a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAE51 16436 bytes

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