Malicious PDF — malware analysis report

Static analysis result for SHA-256 707c8897d7b19493…

MALICIOUS

PDF

45.4 KB Created: 2020-03-30 12:30:16 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 5539ea2071137c1813ddd8e16bc4a9bb SHA-1: 4c858d0420b6f278e6972806379aef1ee1875db8 SHA-256: 707c8897d7b1949378c8b1c9e68cfe4f68952c3ce21fb7d1f48c655a761a1209
136 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDF files on different domains. This behavior is indicative of a link farm or SEO spam campaign, potentially used to distribute malicious content or manipulate search engine rankings. The ML classifier also strongly flagged this PDF as malicious, suggesting a high likelihood of malicious intent behind the link distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://bejustalittlebetter.com/uploads/1/3/1/3/131397983/131397983.html#islamic+baby+boy+names+with+hindi+meaning
    • http://yoniwidesign.com/uploads/1/3/0/5/130588947/2068952.pdf
    • http://boldcityinteriors.com/uploads/1/3/0/6/130640020/455d85be8007.pdf
    • http://hostmaster.propelpaths.com/uploads/1/3/0/2/130288630/4136270.pdf
    • http://hoganbuilders.org/uploads/1/3/0/6/130604258/834c77976f.pdf
    • http://www.theorodat.de/uploads/1/3/0/7/130739836/8087233.pdf
    • http://bachue.org/uploads/1/3/0/4/130491852/1132394.pdf
    • http://georgiaurogyn.com/uploads/1/3/0/6/130639436/4809492.pdf
    • http://creeaski.com/uploads/1/3/1/0/131070398/7007691.pdf
    • http://poiesiscounseling.com/uploads/1/3/0/4/130476135/sazozamijig.pdf
    • http://prosperpresents.com/uploads/1/3/1/3/131384015/7751127.pdf
    • http://deyconstruction.net/uploads/1/3/0/6/130604049/72cbffb0595.pdf
    • http://oliveirasantos.org/uploads/1/3/0/2/130270958/3182540d8d930c.pdf
    • http://clean-room-solutions.com/uploads/1/3/0/6/130639503/d068c19883f27f9.pdf
    • http://waxhawcreekridingacademy.com/uploads/1/3/0/5/130539842/2344508.pdf
    • http://ajacf.com/uploads/1/3/0/5/130538816/fukomidumefimixikez.pdf
    • http://ryanladdesign.com/uploads/1/3/0/2/130289732/xulorevilax.pdf
    • http://schnibblesandsuch.net/uploads/1/3/0/6/130639382/d0f23a1e213.pdf
    • http://ridgesidehomeimprovements.com/uploads/1/3/0/6/130621985/f4a0246ad8b.pdf
    • http://oddhieshop.com/uploads/1/3/0/8/130814343/53389.pdf
    • http://utcbankghanaltd.org/uploads/1/3/0/5/130547116/zigasuwizupala.pdf
    • http://debraallanconsultants.com/uploads/1/3/0/6/130621636/padazuseboge-maloj-vijipoto-funekijemolefo.pdf
    • http://alajmix.com/uploads/1/3/1/0/131071063/9877638.pdf
    • http://brochuaccounting.com/uploads/1/3/0/9/130969678/d9a33ffed.pdf
    • http://intellectualdisabilitiesonline.com/uploads/1/3/0/3/130324419/7755273.pdf
    • http://sellingdalton.com/uploads/1/3/0/5/130538902/xifadavadalef.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_off00007498.bin
cca424fedf9a5175dab3f4f0e98f21b358a7feb51a7488eb0c4908863f3e9157		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7498 7760 bytes
font_01_sfnt_off000092a8.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63		 pdf-font-stream PDF embedded font (sfnt) at offset 0x92A8 16036 bytes

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