Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2d4d060b30d88ec…

MALICIOUS

PDF

42.7 KB Created: 2020-03-29 06:32:52 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: f24f55ba41bfdeee01df5f70d932492f SHA-1: 9af37559e15811138afe69e5a994501497bc4dc1 SHA-256: c2d4d060b30d88ec068d1b98f3569dfe4758fecd7de58d7283a5f8443a84b573
94 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic. The ML classifier also strongly indicated maliciousness. The document body text, though partially corrupted, contains a phrase in Spanish related to structural differences between starch, cellulose, and glycogen, which appears to be a lure to disguise the malicious nature of the embedded links. The primary intent appears to be directing users to a network of potentially malicious websites.

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://mta-sts.mail.dickersongreenseminary.org/uploads/1/3/1/4/131438532/131438532.html#indique+las+diferencias+estructurales+entre+almid%C3%B3n+celulosa+y+gluc%C3%B3geno
    • http://diapai.org/uploads/1/3/0/4/130483581/60d25a.pdf
    • http://littleweddingplanner.co.uk/uploads/1/3/0/8/130873791/zepilazemapil.pdf
    • http://lessecretsdeden.com/uploads/1/3/0/7/130740196/256349a09ea15c.pdf
    • http://brothersnblue.com/uploads/1/3/0/4/130483447/b8189449.pdf
    • http://vanity-fire.net/uploads/1/3/0/9/130969983/23f6c449fce.pdf
    • http://mx.peopleripple.com/uploads/1/3/0/5/130590561/besox.pdf
    • http://nicsantrading.com/uploads/1/3/1/3/131379356/ketedobaxuvifibuzo.pdf
    • http://oilbalance.com/uploads/1/3/0/7/130776120/1386501.pdf
    • http://www.dadsburgersstl.com/uploads/1/3/0/4/130490461/79070.pdf
    • http://hollywoodfirstteam.com/uploads/1/3/0/5/130544437/bizokilamitole_wolovufakide_nimakos.pdf
    • http://martazphotography.martazmusic.com/uploads/1/3/0/7/130739086/4756631.pdf
    • http://lillygranite.com/uploads/1/3/0/4/130494172/fedos-laluzivexopigun-pitedariwezeg-xarovepajime.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_off00006e81.bin
59f24b39bf27df9e598f9151c1db2fd28b52afb17b4e3ce616d54111c51ac9fd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E81 8804 bytes
font_01_sfnt_off00008e70.bin
e9add5f6d3e62e08811a236d71c8292244fed2572708545a25f2e5346f1f1fce		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8E70 3240 bytes

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