Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc7d6a58e0818565…

MALICIOUS

PDF

40.0 KB Created: 2020-04-13 17:30:05 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 31fbe4f32258ecce82cbc44ea5ac2236 SHA-1: 147c47d4188b4440a3162c90c8928bb504c67a17 SHA-256: fc7d6a58e081856547338a11ffd4e338b28dbef4e6830171ef352e5c3c58c887
154 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for Pdf.Dropper.Agent-9275980-0 and an ML classifier output of 0.999976. The PDF contains a large number of external links, many hosted on similar domains with numeric or generic slugs, indicating a link farm or SEO poisoning tactic. One of the embedded URLs is http://friendswoodflutist.com/uploads/1/3/1/4/131438819/131438819.html#custom+resolution+utility+guide, which appears to be the lure text. The primary function seems to be redirecting users to potentially malicious content hosted on these external sites.

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.
  • ClamAV: Pdf.Dropper.Agent-9275980-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Dropper.Agent-9275980-0
  • 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://friendswoodflutist.com/uploads/1/3/1/4/131438819/131438819.html#custom+resolution+utility+guide
    • http://melissapittillo.com/uploads/1/3/0/8/130814591/96babb14.pdf
    • http://musehb.com/uploads/1/3/1/1/131164351/1453599.pdf
    • http://myperfectgem.com/uploads/1/3/1/1/131163763/278276.pdf
    • http://vantagesalon.com/uploads/1/3/1/4/131438353/jipajugadumipudowexi.pdf
    • http://loyrayclemons.com/uploads/1/3/0/7/130739362/8676734.pdf
    • http://goapplex.com/uploads/1/3/1/1/131164312/vozixaxinizu.pdf
    • http://gortizlimpiaduriayventa.com/uploads/1/3/0/6/130603936/ralopogonewedal.pdf
    • http://release-counseling.com/uploads/1/3/0/3/130313120/3949759.pdf
    • http://engforu.com/uploads/1/3/0/7/130775484/neberavurikeviw.pdf
    • http://heartsonfireministries.ca/uploads/1/3/0/7/130776366/dodolajivobed.pdf
    • http://refreshingoasis.org/uploads/1/3/0/8/130873946/1145349.pdf
    • http://naturalalchemyofthetruth.co/uploads/1/3/0/9/130969441/botupi.pdf
    • http://pattyconnellyphotography.com/uploads/1/3/0/2/130273843/342893.pdf
    • http://thejoyoffreedomholisticpsych.com/uploads/1/3/0/5/130588787/rodisekijukowi.pdf
    • http://lafayetteschoolrestoration.com/uploads/1/3/0/9/130969654/9482346.pdf
    • http://loyrayclemons.com/uploads/1/3/0/
    • 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_off00007208.bin
975571af05b2b6e77cccda84bfe6c6935381ba042e6371f0d8d3efaaa474899b
pdf-font-stream PDF embedded font (sfnt) at offset 0x7208 8828 bytes