Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7fd82c82faa85e4…

MALICIOUS

PDF

44.3 KB Created: 2020-03-26 13:15:10 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: e6f6da9b2abe1b8f9b84791ae2303b56 SHA-1: 1ac5c221a24bfceaa060ab846b1efcd3ff17bf66 SHA-256: a7fd82c82faa85e4c3a6fa04cefd117ba57fb2b9c279cd9ec3a908fac3a2bf88
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. The embedded document body text, though partially corrupted, contains a reference to 'stack on 24 gun safe reviews' and a URL, suggesting a lure to external content. The ML classifier strongly flagged this PDF as malicious, indicating a high likelihood of 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://staylow-ls.com/uploads/1/3/1/1/131163962/131163962.html#stack+on+24+gun+safe+reviews
    • http://www.blackjade.club/uploads/1/3/0/7/130775630/tegat-xiloxerakud-vaduvor-palaba.pdf
    • http://castawaycustomsmidwest.com/uploads/1/3/0/3/130379172/2846912.pdf
    • http://ctbflowers.com/uploads/1/3/1/1/131164460/3799080.pdf
    • http://aircraftsheepskincompany.com/uploads/1/3/0/9/130970023/9950675.pdf
    • http://tiedyeharvest.com/uploads/1/3/0/4/130435803/7178693.pdf
    • http://sallycasey.com/uploads/1/3/0/6/130621243/logokagaxe-suzetisonoviroj-kisibukekezok-zaludimekuveva.pdf
    • http://www.blancpaige.com/uploads/1/3/0/6/130603725/9125817.pdf
    • http://ulcergardforhorses.com/uploads/1/3/0/2/130270963/d56e79650ff.pdf
    • http://madameallen.org/uploads/1/3/0/2/130288757/9481418.pdf
    • http://team-30.com/uploads/1/3/0/6/130604700/jezaxapeme_raratarezufo_zarizudemomelop.pdf
    • http://www.tallahasseedevelopment.com/uploads/1/3/0/5/130590353/ribegug.pdf
    • http://craftandgarden.com/uploads/1/3/0/7/130738631/2de73c4d978b54.pdf
    • http://certifiedselfstorage.com/uploads/1/3/0/7/130775389/jugobagiben.pdf
    • http://preferredagpack.com/uploads/1/3/0/4/130488273/1bf4b1881864dd.pdf
    • http://conversationsonthegreen.org/uploads/1/3/0/7/130775610/87b71e194.pdf
    • http://thegrossgroup.net/uploads/1/3/0/5/130588473/4b7dc6abbec.pdf
    • http://josephrossiter.com/uploads/1/3/0/2/130272571/3908840.pdf
    • http://yjcapitalusa.com/uploads/1/3/0/5/130539843/9639153.pdf
    • http://www.linie-e.com/uploads/1/3/0/2/130288939/121da2dcd0e9361.pdf
    • http://bartechnics.com/uploads/1/3/0/2/130272327/74efaa11ad.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 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000086eb.bin
9bbbed6cb3739c553a1c39a9fc87cb2e46149dd30bac7ea4ef4e8db28cf0a809
pdf-font-stream PDF embedded font (sfnt) at offset 0x86EB 7332 bytes