Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0febcd6379af321…

MALICIOUS

PDF

50.4 KB Created: 2020-03-17 02:06:05 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: c7f5843cc37cc95305b8d5b8c7bf12d8 SHA-1: 3aa447a604857084a97e4c5fb2ce52e8d939febb SHA-256: b0febcd6379af32158c50b59817c9c3b4527dd25288357e61e0fdc9a06db6a9f
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or SEO spam operation. The ML classifier also strongly flagged this PDF as malicious. The document body, though partially corrupted, contains text related to literature and author information, which is likely used as a lure to disguise the malicious intent of directing users to numerous external PDF files hosted on various domains. No scripts were extracted from this sample.

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://litecoinrealestate.com/uploads/1/3/0/6/130604158/130604158.html#literatura+universal+autores+y+obras
    • http://www.mrcosciaseconomicsclass.bronxbash.com/uploads/1/3/0/7/130776223/96db2a9ecdba294.pdf
    • http://assistancedogassociation.com/uploads/1/3/0/5/130541597/dobuxuto_lugerijezima_jinuzozepepuvu.pdf
    • http://prg5.com/uploads/1/3/0/5/130541004/f15d940.pdf
    • http://backyardsanctuarydfw.com/uploads/1/3/0/6/130621683/kidiginafopu.pdf
    • http://slatefarmsnc.com/uploads/1/3/0/4/130483551/8444636.pdf
    • http://www.al-qalamproject.org/uploads/1/3/0/7/130738739/7952790.pdf
    • http://alpeshome.info/uploads/1/3/0/3/130323355/d782ca0f0.pdf
    • http://www.skagitgroupinsurance.com/uploads/1/3/0/4/130483320/a78e6bcb380397.pdf
    • http://www.undefeatedband.com/uploads/1/3/0/2/130288486/8996440.pdf
    • http://rwclarkconst.com/uploads/1/3/0/4/130488063/ranewitotirunuzojab.pdf
    • http://malibusalsa.com/uploads/1/3/0/2/130288391/ba1c7360ef6cd83.pdf
    • http://innparadisekauai.com/uploads/1/3/0/7/130775424/bokafadogora_lulasafuwewa.pdf
    • http://24hourelectricianfl.com/uploads/1/3/0/6/130604885/tekulejoji.pdf
    • http://www.catalinamicrobladinglv.com/uploads/1/3/0/2/130289045/8930158.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_off00009a48.bin
e2623b4815f569dd39aef7b59d9ebefbf2abec354776931ae0cae2a7b376e895		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9A48 9084 bytes

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