Malicious PDF — malware analysis report

Static analysis result for SHA-256 27ffcbe2a5cc10ee…

MALICIOUS

PDF

45.0 KB Created: 2020-03-29 06:56:25 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 0b360f1664563740f0704c3da73f6b4c SHA-1: 74a1ef80a935cb4886083dec748db4eab24f6765 SHA-256: 27ffcbe2a5cc10eede1ab658d6410dc3b739810bc78fb2797cb43f4d4dc35d15
94 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, a technique often used for SEO poisoning or to redirect users to malicious sites. The ML classifier strongly indicated maliciousness. The document body, though partially corrupted, contains references to the URLs, suggesting a deliberate attempt to drive traffic to these external resources.

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://hostmaster.guentertouschek.com/uploads/1/3/1/3/131383580/131383580.html#como+convertir+los+grados+centigrados+a+fahrenheit
    • http://aaamarinesurvey.biz/uploads/1/3/0/7/130739830/pifokok_lanib_mafirupimow_nenadatugurate.pdf
    • http://syedholdingsllc.com/uploads/1/3/0/6/130639026/6948745.pdf
    • http://autodiscover.annaydawson.com/uploads/1/3/0/2/130270911/mavibobonopikojasezi.pdf
    • http://spiritedquest-equine.com/uploads/1/3/0/5/130590545/3377111.pdf
    • http://elnagyllenhammar.com/uploads/1/3/0/7/130776276/kalexemonebiwa.pdf
    • http://choseniii.com/uploads/1/3/0/7/130775320/jupalutixezijesore.pdf
    • http://abmainsource.org/uploads/1/3/0/6/130620861/tupowoj.pdf
    • http://ungranitodearena.net/uploads/1/3/0/5/130551651/bemurazatagijob-terubipuxolarem-kejutasaziji-ximixozapufigek.pdf
    • http://jrdbuildingsurveying.com/uploads/1/3/0/2/130289649/2089507.pdf
    • http://mta-sts.mail.nycmovers.com/uploads/1/3/0/5/130539842/puduxujagoro_tapidi.pdf
    • http://shawndgay.com/uploads/1/3/0/8/130815381/fijafewisidazi.pdf
    • http://emmamiremadi.com/uploads/1/3/0/2/130270845/boxilokojepewata.pdf
    • http://74-123-78-182.mgwnet.com/uploads/1/3/0/6/130621111/c1859fa4d371b.pdf
    • http://hostmaster.lukeandharry.info/uploads/1/3/0/7/130775163/gekanu.pdf
    • http://ramundogospel.com/uploads/1/3/0/6/130605156/0ff4fd47744.pdf
    • http://ciibackgrounds.com/uploads/1/3/0/8/130814858/ganine.pdf
    • http://goldenbright.net/uploads/1/3/0/6/130620747/bozesupel.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_off00007060.bin
15844e3a7c38a2adea1ff906764583d34672ea58897c593b597aed0b035fee5c
pdf-font-stream PDF embedded font (sfnt) at offset 0x7060 8052 bytes
font_01_sfnt_off00008e34.bin
9c2a6fbe88b4d4faaae2bd4775e9f08b7c1d421fd39e5cc86f58a01a0c1abc6e
pdf-font-stream PDF embedded font (sfnt) at offset 0x8E34 16416 bytes